cb66eb0dec
importlib.machinery that provide the suffix details for import. The attributes were not put on imp so as to compartmentalize everything importlib needs for setting up imports in importlib.machinery. This also led to an indirect deprecation of inspect.getmoduleinfo() as it directly returned imp.get_suffix's returned tuple which no longer makes sense.
1225 lines
47 KiB
Python
1225 lines
47 KiB
Python
"""Get useful information from live Python objects.
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This module encapsulates the interface provided by the internal special
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attributes (co_*, im_*, tb_*, etc.) in a friendlier fashion.
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It also provides some help for examining source code and class layout.
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Here are some of the useful functions provided by this module:
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ismodule(), isclass(), ismethod(), isfunction(), isgeneratorfunction(),
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isgenerator(), istraceback(), isframe(), iscode(), isbuiltin(),
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isroutine() - check object types
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getmembers() - get members of an object that satisfy a given condition
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getfile(), getsourcefile(), getsource() - find an object's source code
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getdoc(), getcomments() - get documentation on an object
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getmodule() - determine the module that an object came from
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getclasstree() - arrange classes so as to represent their hierarchy
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getargspec(), getargvalues(), getcallargs() - get info about function arguments
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getfullargspec() - same, with support for Python-3000 features
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formatargspec(), formatargvalues() - format an argument spec
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getouterframes(), getinnerframes() - get info about frames
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currentframe() - get the current stack frame
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stack(), trace() - get info about frames on the stack or in a traceback
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"""
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# This module is in the public domain. No warranties.
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__author__ = 'Ka-Ping Yee <ping@lfw.org>'
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__date__ = '1 Jan 2001'
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import imp
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import importlib.machinery
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import itertools
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import linecache
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import os
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import re
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import sys
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import tokenize
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import types
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from operator import attrgetter
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from collections import namedtuple
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# Create constants for the compiler flags in Include/code.h
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# We try to get them from dis to avoid duplication, but fall
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# back to hardcording so the dependency is optional
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try:
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from dis import COMPILER_FLAG_NAMES as _flag_names
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except ImportError:
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CO_OPTIMIZED, CO_NEWLOCALS = 0x1, 0x2
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CO_VARARGS, CO_VARKEYWORDS = 0x4, 0x8
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CO_NESTED, CO_GENERATOR, CO_NOFREE = 0x10, 0x20, 0x40
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else:
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mod_dict = globals()
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for k, v in _flag_names.items():
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mod_dict["CO_" + v] = k
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# See Include/object.h
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TPFLAGS_IS_ABSTRACT = 1 << 20
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# ----------------------------------------------------------- type-checking
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def ismodule(object):
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"""Return true if the object is a module.
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Module objects provide these attributes:
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__cached__ pathname to byte compiled file
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__doc__ documentation string
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__file__ filename (missing for built-in modules)"""
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return isinstance(object, types.ModuleType)
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def isclass(object):
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"""Return true if the object is a class.
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Class objects provide these attributes:
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__doc__ documentation string
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__module__ name of module in which this class was defined"""
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return isinstance(object, type)
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def ismethod(object):
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"""Return true if the object is an instance method.
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Instance method objects provide these attributes:
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__doc__ documentation string
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__name__ name with which this method was defined
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__func__ function object containing implementation of method
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__self__ instance to which this method is bound"""
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return isinstance(object, types.MethodType)
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def ismethoddescriptor(object):
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"""Return true if the object is a method descriptor.
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But not if ismethod() or isclass() or isfunction() are true.
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This is new in Python 2.2, and, for example, is true of int.__add__.
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An object passing this test has a __get__ attribute but not a __set__
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attribute, but beyond that the set of attributes varies. __name__ is
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usually sensible, and __doc__ often is.
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Methods implemented via descriptors that also pass one of the other
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tests return false from the ismethoddescriptor() test, simply because
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the other tests promise more -- you can, e.g., count on having the
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__func__ attribute (etc) when an object passes ismethod()."""
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if isclass(object) or ismethod(object) or isfunction(object):
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# mutual exclusion
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return False
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tp = type(object)
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return hasattr(tp, "__get__") and not hasattr(tp, "__set__")
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def isdatadescriptor(object):
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"""Return true if the object is a data descriptor.
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Data descriptors have both a __get__ and a __set__ attribute. Examples are
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properties (defined in Python) and getsets and members (defined in C).
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Typically, data descriptors will also have __name__ and __doc__ attributes
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(properties, getsets, and members have both of these attributes), but this
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is not guaranteed."""
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if isclass(object) or ismethod(object) or isfunction(object):
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# mutual exclusion
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return False
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tp = type(object)
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return hasattr(tp, "__set__") and hasattr(tp, "__get__")
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if hasattr(types, 'MemberDescriptorType'):
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# CPython and equivalent
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def ismemberdescriptor(object):
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"""Return true if the object is a member descriptor.
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Member descriptors are specialized descriptors defined in extension
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modules."""
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return isinstance(object, types.MemberDescriptorType)
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else:
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# Other implementations
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def ismemberdescriptor(object):
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"""Return true if the object is a member descriptor.
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Member descriptors are specialized descriptors defined in extension
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modules."""
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return False
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if hasattr(types, 'GetSetDescriptorType'):
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# CPython and equivalent
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def isgetsetdescriptor(object):
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"""Return true if the object is a getset descriptor.
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getset descriptors are specialized descriptors defined in extension
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modules."""
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return isinstance(object, types.GetSetDescriptorType)
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else:
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# Other implementations
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def isgetsetdescriptor(object):
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"""Return true if the object is a getset descriptor.
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getset descriptors are specialized descriptors defined in extension
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modules."""
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return False
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def isfunction(object):
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"""Return true if the object is a user-defined function.
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Function objects provide these attributes:
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__doc__ documentation string
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__name__ name with which this function was defined
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__code__ code object containing compiled function bytecode
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__defaults__ tuple of any default values for arguments
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__globals__ global namespace in which this function was defined
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__annotations__ dict of parameter annotations
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__kwdefaults__ dict of keyword only parameters with defaults"""
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return isinstance(object, types.FunctionType)
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def isgeneratorfunction(object):
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"""Return true if the object is a user-defined generator function.
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Generator function objects provides same attributes as functions.
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See help(isfunction) for attributes listing."""
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return bool((isfunction(object) or ismethod(object)) and
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object.__code__.co_flags & CO_GENERATOR)
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def isgenerator(object):
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"""Return true if the object is a generator.
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Generator objects provide these attributes:
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__iter__ defined to support interation over container
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close raises a new GeneratorExit exception inside the
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generator to terminate the iteration
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gi_code code object
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gi_frame frame object or possibly None once the generator has
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been exhausted
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gi_running set to 1 when generator is executing, 0 otherwise
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next return the next item from the container
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send resumes the generator and "sends" a value that becomes
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the result of the current yield-expression
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throw used to raise an exception inside the generator"""
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return isinstance(object, types.GeneratorType)
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def istraceback(object):
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"""Return true if the object is a traceback.
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Traceback objects provide these attributes:
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tb_frame frame object at this level
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tb_lasti index of last attempted instruction in bytecode
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tb_lineno current line number in Python source code
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tb_next next inner traceback object (called by this level)"""
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return isinstance(object, types.TracebackType)
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def isframe(object):
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"""Return true if the object is a frame object.
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Frame objects provide these attributes:
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f_back next outer frame object (this frame's caller)
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f_builtins built-in namespace seen by this frame
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f_code code object being executed in this frame
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f_globals global namespace seen by this frame
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f_lasti index of last attempted instruction in bytecode
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f_lineno current line number in Python source code
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f_locals local namespace seen by this frame
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f_trace tracing function for this frame, or None"""
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return isinstance(object, types.FrameType)
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def iscode(object):
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"""Return true if the object is a code object.
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Code objects provide these attributes:
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co_argcount number of arguments (not including * or ** args)
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co_code string of raw compiled bytecode
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co_consts tuple of constants used in the bytecode
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co_filename name of file in which this code object was created
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co_firstlineno number of first line in Python source code
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co_flags bitmap: 1=optimized | 2=newlocals | 4=*arg | 8=**arg
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co_lnotab encoded mapping of line numbers to bytecode indices
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co_name name with which this code object was defined
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co_names tuple of names of local variables
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co_nlocals number of local variables
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co_stacksize virtual machine stack space required
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co_varnames tuple of names of arguments and local variables"""
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return isinstance(object, types.CodeType)
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def isbuiltin(object):
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"""Return true if the object is a built-in function or method.
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Built-in functions and methods provide these attributes:
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__doc__ documentation string
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__name__ original name of this function or method
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__self__ instance to which a method is bound, or None"""
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return isinstance(object, types.BuiltinFunctionType)
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def isroutine(object):
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"""Return true if the object is any kind of function or method."""
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return (isbuiltin(object)
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or isfunction(object)
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or ismethod(object)
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or ismethoddescriptor(object))
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def isabstract(object):
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"""Return true if the object is an abstract base class (ABC)."""
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return bool(isinstance(object, type) and object.__flags__ & TPFLAGS_IS_ABSTRACT)
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def getmembers(object, predicate=None):
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"""Return all members of an object as (name, value) pairs sorted by name.
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Optionally, only return members that satisfy a given predicate."""
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if isclass(object):
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mro = (object,) + getmro(object)
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else:
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mro = ()
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results = []
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for key in dir(object):
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# First try to get the value via __dict__. Some descriptors don't
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# like calling their __get__ (see bug #1785).
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for base in mro:
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if key in base.__dict__:
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value = base.__dict__[key]
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break
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else:
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try:
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value = getattr(object, key)
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except AttributeError:
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continue
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if not predicate or predicate(value):
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results.append((key, value))
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results.sort()
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return results
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Attribute = namedtuple('Attribute', 'name kind defining_class object')
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|
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def classify_class_attrs(cls):
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"""Return list of attribute-descriptor tuples.
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|
For each name in dir(cls), the return list contains a 4-tuple
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with these elements:
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0. The name (a string).
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1. The kind of attribute this is, one of these strings:
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'class method' created via classmethod()
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'static method' created via staticmethod()
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'property' created via property()
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'method' any other flavor of method
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'data' not a method
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2. The class which defined this attribute (a class).
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3. The object as obtained directly from the defining class's
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__dict__, not via getattr. This is especially important for
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data attributes: C.data is just a data object, but
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C.__dict__['data'] may be a data descriptor with additional
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info, like a __doc__ string.
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"""
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mro = getmro(cls)
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names = dir(cls)
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result = []
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for name in names:
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# Get the object associated with the name, and where it was defined.
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# Getting an obj from the __dict__ sometimes reveals more than
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# using getattr. Static and class methods are dramatic examples.
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# Furthermore, some objects may raise an Exception when fetched with
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# getattr(). This is the case with some descriptors (bug #1785).
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# Thus, we only use getattr() as a last resort.
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homecls = None
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for base in (cls,) + mro:
|
|
if name in base.__dict__:
|
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obj = base.__dict__[name]
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|
homecls = base
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|
break
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|
else:
|
|
obj = getattr(cls, name)
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|
homecls = getattr(obj, "__objclass__", homecls)
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|
|
|
# Classify the object.
|
|
if isinstance(obj, staticmethod):
|
|
kind = "static method"
|
|
elif isinstance(obj, classmethod):
|
|
kind = "class method"
|
|
elif isinstance(obj, property):
|
|
kind = "property"
|
|
elif ismethoddescriptor(obj):
|
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kind = "method"
|
|
elif isdatadescriptor(obj):
|
|
kind = "data"
|
|
else:
|
|
obj_via_getattr = getattr(cls, name)
|
|
if (isfunction(obj_via_getattr) or
|
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ismethoddescriptor(obj_via_getattr)):
|
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kind = "method"
|
|
else:
|
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kind = "data"
|
|
obj = obj_via_getattr
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|
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result.append(Attribute(name, kind, homecls, obj))
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|
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return result
|
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|
|
# ----------------------------------------------------------- class helpers
|
|
|
|
def getmro(cls):
|
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"Return tuple of base classes (including cls) in method resolution order."
|
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return cls.__mro__
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|
|
|
# -------------------------------------------------- source code extraction
|
|
def indentsize(line):
|
|
"""Return the indent size, in spaces, at the start of a line of text."""
|
|
expline = line.expandtabs()
|
|
return len(expline) - len(expline.lstrip())
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|
|
|
def getdoc(object):
|
|
"""Get the documentation string for an object.
|
|
|
|
All tabs are expanded to spaces. To clean up docstrings that are
|
|
indented to line up with blocks of code, any whitespace than can be
|
|
uniformly removed from the second line onwards is removed."""
|
|
try:
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|
doc = object.__doc__
|
|
except AttributeError:
|
|
return None
|
|
if not isinstance(doc, str):
|
|
return None
|
|
return cleandoc(doc)
|
|
|
|
def cleandoc(doc):
|
|
"""Clean up indentation from docstrings.
|
|
|
|
Any whitespace that can be uniformly removed from the second line
|
|
onwards is removed."""
|
|
try:
|
|
lines = doc.expandtabs().split('\n')
|
|
except UnicodeError:
|
|
return None
|
|
else:
|
|
# Find minimum indentation of any non-blank lines after first line.
|
|
margin = sys.maxsize
|
|
for line in lines[1:]:
|
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content = len(line.lstrip())
|
|
if content:
|
|
indent = len(line) - content
|
|
margin = min(margin, indent)
|
|
# Remove indentation.
|
|
if lines:
|
|
lines[0] = lines[0].lstrip()
|
|
if margin < sys.maxsize:
|
|
for i in range(1, len(lines)): lines[i] = lines[i][margin:]
|
|
# Remove any trailing or leading blank lines.
|
|
while lines and not lines[-1]:
|
|
lines.pop()
|
|
while lines and not lines[0]:
|
|
lines.pop(0)
|
|
return '\n'.join(lines)
|
|
|
|
def getfile(object):
|
|
"""Work out which source or compiled file an object was defined in."""
|
|
if ismodule(object):
|
|
if hasattr(object, '__file__'):
|
|
return object.__file__
|
|
raise TypeError('{!r} is a built-in module'.format(object))
|
|
if isclass(object):
|
|
object = sys.modules.get(object.__module__)
|
|
if hasattr(object, '__file__'):
|
|
return object.__file__
|
|
raise TypeError('{!r} is a built-in class'.format(object))
|
|
if ismethod(object):
|
|
object = object.__func__
|
|
if isfunction(object):
|
|
object = object.__code__
|
|
if istraceback(object):
|
|
object = object.tb_frame
|
|
if isframe(object):
|
|
object = object.f_code
|
|
if iscode(object):
|
|
return object.co_filename
|
|
raise TypeError('{!r} is not a module, class, method, '
|
|
'function, traceback, frame, or code object'.format(object))
|
|
|
|
ModuleInfo = namedtuple('ModuleInfo', 'name suffix mode module_type')
|
|
|
|
def getmoduleinfo(path):
|
|
"""Get the module name, suffix, mode, and module type for a given file."""
|
|
warnings.warn('inspect.getmoduleinfo() is deprecated', DeprecationWarning,
|
|
2)
|
|
filename = os.path.basename(path)
|
|
suffixes = [(-len(suffix), suffix, mode, mtype)
|
|
for suffix, mode, mtype in imp.get_suffixes()]
|
|
suffixes.sort() # try longest suffixes first, in case they overlap
|
|
for neglen, suffix, mode, mtype in suffixes:
|
|
if filename[neglen:] == suffix:
|
|
return ModuleInfo(filename[:neglen], suffix, mode, mtype)
|
|
|
|
def getmodulename(path):
|
|
"""Return the module name for a given file, or None."""
|
|
info = getmoduleinfo(path)
|
|
if info: return info[0]
|
|
|
|
def getsourcefile(object):
|
|
"""Return the filename that can be used to locate an object's source.
|
|
Return None if no way can be identified to get the source.
|
|
"""
|
|
filename = getfile(object)
|
|
all_bytecode_suffixes = importlib.machinery.DEBUG_BYTECODE_SUFFIXES[:]
|
|
all_bytecode_suffixes += importlib.machinery.OPTIMIZED_BYTECODE_SUFFIXES[:]
|
|
if any(filename.endswith(s) for s in all_bytecode_suffixes):
|
|
filename = (os.path.splitext(filename)[0] +
|
|
importlib.machinery.SOURCE_SUFFIXES[0])
|
|
elif any(filename.endswith(s) for s in
|
|
importlib.machinery.EXTENSION_SUFFIXES):
|
|
return None
|
|
if os.path.exists(filename):
|
|
return filename
|
|
# only return a non-existent filename if the module has a PEP 302 loader
|
|
if hasattr(getmodule(object, filename), '__loader__'):
|
|
return filename
|
|
# or it is in the linecache
|
|
if filename in linecache.cache:
|
|
return filename
|
|
|
|
def getabsfile(object, _filename=None):
|
|
"""Return an absolute path to the source or compiled file for an object.
|
|
|
|
The idea is for each object to have a unique origin, so this routine
|
|
normalizes the result as much as possible."""
|
|
if _filename is None:
|
|
_filename = getsourcefile(object) or getfile(object)
|
|
return os.path.normcase(os.path.abspath(_filename))
|
|
|
|
modulesbyfile = {}
|
|
_filesbymodname = {}
|
|
|
|
def getmodule(object, _filename=None):
|
|
"""Return the module an object was defined in, or None if not found."""
|
|
if ismodule(object):
|
|
return object
|
|
if hasattr(object, '__module__'):
|
|
return sys.modules.get(object.__module__)
|
|
# Try the filename to modulename cache
|
|
if _filename is not None and _filename in modulesbyfile:
|
|
return sys.modules.get(modulesbyfile[_filename])
|
|
# Try the cache again with the absolute file name
|
|
try:
|
|
file = getabsfile(object, _filename)
|
|
except TypeError:
|
|
return None
|
|
if file in modulesbyfile:
|
|
return sys.modules.get(modulesbyfile[file])
|
|
# Update the filename to module name cache and check yet again
|
|
# Copy sys.modules in order to cope with changes while iterating
|
|
for modname, module in list(sys.modules.items()):
|
|
if ismodule(module) and hasattr(module, '__file__'):
|
|
f = module.__file__
|
|
if f == _filesbymodname.get(modname, None):
|
|
# Have already mapped this module, so skip it
|
|
continue
|
|
_filesbymodname[modname] = f
|
|
f = getabsfile(module)
|
|
# Always map to the name the module knows itself by
|
|
modulesbyfile[f] = modulesbyfile[
|
|
os.path.realpath(f)] = module.__name__
|
|
if file in modulesbyfile:
|
|
return sys.modules.get(modulesbyfile[file])
|
|
# Check the main module
|
|
main = sys.modules['__main__']
|
|
if not hasattr(object, '__name__'):
|
|
return None
|
|
if hasattr(main, object.__name__):
|
|
mainobject = getattr(main, object.__name__)
|
|
if mainobject is object:
|
|
return main
|
|
# Check builtins
|
|
builtin = sys.modules['builtins']
|
|
if hasattr(builtin, object.__name__):
|
|
builtinobject = getattr(builtin, object.__name__)
|
|
if builtinobject is object:
|
|
return builtin
|
|
|
|
def findsource(object):
|
|
"""Return the entire source file and starting line number for an object.
|
|
|
|
The argument may be a module, class, method, function, traceback, frame,
|
|
or code object. The source code is returned as a list of all the lines
|
|
in the file and the line number indexes a line in that list. An IOError
|
|
is raised if the source code cannot be retrieved."""
|
|
|
|
file = getfile(object)
|
|
sourcefile = getsourcefile(object)
|
|
if not sourcefile and file[0] + file[-1] != '<>':
|
|
raise IOError('source code not available')
|
|
file = sourcefile if sourcefile else file
|
|
|
|
module = getmodule(object, file)
|
|
if module:
|
|
lines = linecache.getlines(file, module.__dict__)
|
|
else:
|
|
lines = linecache.getlines(file)
|
|
if not lines:
|
|
raise IOError('could not get source code')
|
|
|
|
if ismodule(object):
|
|
return lines, 0
|
|
|
|
if isclass(object):
|
|
name = object.__name__
|
|
pat = re.compile(r'^(\s*)class\s*' + name + r'\b')
|
|
# make some effort to find the best matching class definition:
|
|
# use the one with the least indentation, which is the one
|
|
# that's most probably not inside a function definition.
|
|
candidates = []
|
|
for i in range(len(lines)):
|
|
match = pat.match(lines[i])
|
|
if match:
|
|
# if it's at toplevel, it's already the best one
|
|
if lines[i][0] == 'c':
|
|
return lines, i
|
|
# else add whitespace to candidate list
|
|
candidates.append((match.group(1), i))
|
|
if candidates:
|
|
# this will sort by whitespace, and by line number,
|
|
# less whitespace first
|
|
candidates.sort()
|
|
return lines, candidates[0][1]
|
|
else:
|
|
raise IOError('could not find class definition')
|
|
|
|
if ismethod(object):
|
|
object = object.__func__
|
|
if isfunction(object):
|
|
object = object.__code__
|
|
if istraceback(object):
|
|
object = object.tb_frame
|
|
if isframe(object):
|
|
object = object.f_code
|
|
if iscode(object):
|
|
if not hasattr(object, 'co_firstlineno'):
|
|
raise IOError('could not find function definition')
|
|
lnum = object.co_firstlineno - 1
|
|
pat = re.compile(r'^(\s*def\s)|(.*(?<!\w)lambda(:|\s))|^(\s*@)')
|
|
while lnum > 0:
|
|
if pat.match(lines[lnum]): break
|
|
lnum = lnum - 1
|
|
return lines, lnum
|
|
raise IOError('could not find code object')
|
|
|
|
def getcomments(object):
|
|
"""Get lines of comments immediately preceding an object's source code.
|
|
|
|
Returns None when source can't be found.
|
|
"""
|
|
try:
|
|
lines, lnum = findsource(object)
|
|
except (IOError, TypeError):
|
|
return None
|
|
|
|
if ismodule(object):
|
|
# Look for a comment block at the top of the file.
|
|
start = 0
|
|
if lines and lines[0][:2] == '#!': start = 1
|
|
while start < len(lines) and lines[start].strip() in ('', '#'):
|
|
start = start + 1
|
|
if start < len(lines) and lines[start][:1] == '#':
|
|
comments = []
|
|
end = start
|
|
while end < len(lines) and lines[end][:1] == '#':
|
|
comments.append(lines[end].expandtabs())
|
|
end = end + 1
|
|
return ''.join(comments)
|
|
|
|
# Look for a preceding block of comments at the same indentation.
|
|
elif lnum > 0:
|
|
indent = indentsize(lines[lnum])
|
|
end = lnum - 1
|
|
if end >= 0 and lines[end].lstrip()[:1] == '#' and \
|
|
indentsize(lines[end]) == indent:
|
|
comments = [lines[end].expandtabs().lstrip()]
|
|
if end > 0:
|
|
end = end - 1
|
|
comment = lines[end].expandtabs().lstrip()
|
|
while comment[:1] == '#' and indentsize(lines[end]) == indent:
|
|
comments[:0] = [comment]
|
|
end = end - 1
|
|
if end < 0: break
|
|
comment = lines[end].expandtabs().lstrip()
|
|
while comments and comments[0].strip() == '#':
|
|
comments[:1] = []
|
|
while comments and comments[-1].strip() == '#':
|
|
comments[-1:] = []
|
|
return ''.join(comments)
|
|
|
|
class EndOfBlock(Exception): pass
|
|
|
|
class BlockFinder:
|
|
"""Provide a tokeneater() method to detect the end of a code block."""
|
|
def __init__(self):
|
|
self.indent = 0
|
|
self.islambda = False
|
|
self.started = False
|
|
self.passline = False
|
|
self.last = 1
|
|
|
|
def tokeneater(self, type, token, srowcol, erowcol, line):
|
|
if not self.started:
|
|
# look for the first "def", "class" or "lambda"
|
|
if token in ("def", "class", "lambda"):
|
|
if token == "lambda":
|
|
self.islambda = True
|
|
self.started = True
|
|
self.passline = True # skip to the end of the line
|
|
elif type == tokenize.NEWLINE:
|
|
self.passline = False # stop skipping when a NEWLINE is seen
|
|
self.last = srowcol[0]
|
|
if self.islambda: # lambdas always end at the first NEWLINE
|
|
raise EndOfBlock
|
|
elif self.passline:
|
|
pass
|
|
elif type == tokenize.INDENT:
|
|
self.indent = self.indent + 1
|
|
self.passline = True
|
|
elif type == tokenize.DEDENT:
|
|
self.indent = self.indent - 1
|
|
# the end of matching indent/dedent pairs end a block
|
|
# (note that this only works for "def"/"class" blocks,
|
|
# not e.g. for "if: else:" or "try: finally:" blocks)
|
|
if self.indent <= 0:
|
|
raise EndOfBlock
|
|
elif self.indent == 0 and type not in (tokenize.COMMENT, tokenize.NL):
|
|
# any other token on the same indentation level end the previous
|
|
# block as well, except the pseudo-tokens COMMENT and NL.
|
|
raise EndOfBlock
|
|
|
|
def getblock(lines):
|
|
"""Extract the block of code at the top of the given list of lines."""
|
|
blockfinder = BlockFinder()
|
|
try:
|
|
tokens = tokenize.generate_tokens(iter(lines).__next__)
|
|
for _token in tokens:
|
|
blockfinder.tokeneater(*_token)
|
|
except (EndOfBlock, IndentationError):
|
|
pass
|
|
return lines[:blockfinder.last]
|
|
|
|
def getsourcelines(object):
|
|
"""Return a list of source lines and starting line number for an object.
|
|
|
|
The argument may be a module, class, method, function, traceback, frame,
|
|
or code object. The source code is returned as a list of the lines
|
|
corresponding to the object and the line number indicates where in the
|
|
original source file the first line of code was found. An IOError is
|
|
raised if the source code cannot be retrieved."""
|
|
lines, lnum = findsource(object)
|
|
|
|
if ismodule(object): return lines, 0
|
|
else: return getblock(lines[lnum:]), lnum + 1
|
|
|
|
def getsource(object):
|
|
"""Return the text of the source code for an object.
|
|
|
|
The argument may be a module, class, method, function, traceback, frame,
|
|
or code object. The source code is returned as a single string. An
|
|
IOError is raised if the source code cannot be retrieved."""
|
|
lines, lnum = getsourcelines(object)
|
|
return ''.join(lines)
|
|
|
|
# --------------------------------------------------- class tree extraction
|
|
def walktree(classes, children, parent):
|
|
"""Recursive helper function for getclasstree()."""
|
|
results = []
|
|
classes.sort(key=attrgetter('__module__', '__name__'))
|
|
for c in classes:
|
|
results.append((c, c.__bases__))
|
|
if c in children:
|
|
results.append(walktree(children[c], children, c))
|
|
return results
|
|
|
|
def getclasstree(classes, unique=False):
|
|
"""Arrange the given list of classes into a hierarchy of nested lists.
|
|
|
|
Where a nested list appears, it contains classes derived from the class
|
|
whose entry immediately precedes the list. Each entry is a 2-tuple
|
|
containing a class and a tuple of its base classes. If the 'unique'
|
|
argument is true, exactly one entry appears in the returned structure
|
|
for each class in the given list. Otherwise, classes using multiple
|
|
inheritance and their descendants will appear multiple times."""
|
|
children = {}
|
|
roots = []
|
|
for c in classes:
|
|
if c.__bases__:
|
|
for parent in c.__bases__:
|
|
if not parent in children:
|
|
children[parent] = []
|
|
children[parent].append(c)
|
|
if unique and parent in classes: break
|
|
elif c not in roots:
|
|
roots.append(c)
|
|
for parent in children:
|
|
if parent not in classes:
|
|
roots.append(parent)
|
|
return walktree(roots, children, None)
|
|
|
|
# ------------------------------------------------ argument list extraction
|
|
Arguments = namedtuple('Arguments', 'args, varargs, varkw')
|
|
|
|
def getargs(co):
|
|
"""Get information about the arguments accepted by a code object.
|
|
|
|
Three things are returned: (args, varargs, varkw), where
|
|
'args' is the list of argument names. Keyword-only arguments are
|
|
appended. 'varargs' and 'varkw' are the names of the * and **
|
|
arguments or None."""
|
|
args, varargs, kwonlyargs, varkw = _getfullargs(co)
|
|
return Arguments(args + kwonlyargs, varargs, varkw)
|
|
|
|
def _getfullargs(co):
|
|
"""Get information about the arguments accepted by a code object.
|
|
|
|
Four things are returned: (args, varargs, kwonlyargs, varkw), where
|
|
'args' and 'kwonlyargs' are lists of argument names, and 'varargs'
|
|
and 'varkw' are the names of the * and ** arguments or None."""
|
|
|
|
if not iscode(co):
|
|
raise TypeError('{!r} is not a code object'.format(co))
|
|
|
|
nargs = co.co_argcount
|
|
names = co.co_varnames
|
|
nkwargs = co.co_kwonlyargcount
|
|
args = list(names[:nargs])
|
|
kwonlyargs = list(names[nargs:nargs+nkwargs])
|
|
step = 0
|
|
|
|
nargs += nkwargs
|
|
varargs = None
|
|
if co.co_flags & CO_VARARGS:
|
|
varargs = co.co_varnames[nargs]
|
|
nargs = nargs + 1
|
|
varkw = None
|
|
if co.co_flags & CO_VARKEYWORDS:
|
|
varkw = co.co_varnames[nargs]
|
|
return args, varargs, kwonlyargs, varkw
|
|
|
|
|
|
ArgSpec = namedtuple('ArgSpec', 'args varargs keywords defaults')
|
|
|
|
def getargspec(func):
|
|
"""Get the names and default values of a function's arguments.
|
|
|
|
A tuple of four things is returned: (args, varargs, varkw, defaults).
|
|
'args' is a list of the argument names.
|
|
'args' will include keyword-only argument names.
|
|
'varargs' and 'varkw' are the names of the * and ** arguments or None.
|
|
'defaults' is an n-tuple of the default values of the last n arguments.
|
|
|
|
Use the getfullargspec() API for Python-3000 code, as annotations
|
|
and keyword arguments are supported. getargspec() will raise ValueError
|
|
if the func has either annotations or keyword arguments.
|
|
"""
|
|
|
|
args, varargs, varkw, defaults, kwonlyargs, kwonlydefaults, ann = \
|
|
getfullargspec(func)
|
|
if kwonlyargs or ann:
|
|
raise ValueError("Function has keyword-only arguments or annotations"
|
|
", use getfullargspec() API which can support them")
|
|
return ArgSpec(args, varargs, varkw, defaults)
|
|
|
|
FullArgSpec = namedtuple('FullArgSpec',
|
|
'args, varargs, varkw, defaults, kwonlyargs, kwonlydefaults, annotations')
|
|
|
|
def getfullargspec(func):
|
|
"""Get the names and default values of a function's arguments.
|
|
|
|
A tuple of seven things is returned:
|
|
(args, varargs, varkw, defaults, kwonlyargs, kwonlydefaults annotations).
|
|
'args' is a list of the argument names.
|
|
'varargs' and 'varkw' are the names of the * and ** arguments or None.
|
|
'defaults' is an n-tuple of the default values of the last n arguments.
|
|
'kwonlyargs' is a list of keyword-only argument names.
|
|
'kwonlydefaults' is a dictionary mapping names from kwonlyargs to defaults.
|
|
'annotations' is a dictionary mapping argument names to annotations.
|
|
|
|
The first four items in the tuple correspond to getargspec().
|
|
"""
|
|
|
|
if ismethod(func):
|
|
func = func.__func__
|
|
if not isfunction(func):
|
|
raise TypeError('{!r} is not a Python function'.format(func))
|
|
args, varargs, kwonlyargs, varkw = _getfullargs(func.__code__)
|
|
return FullArgSpec(args, varargs, varkw, func.__defaults__,
|
|
kwonlyargs, func.__kwdefaults__, func.__annotations__)
|
|
|
|
ArgInfo = namedtuple('ArgInfo', 'args varargs keywords locals')
|
|
|
|
def getargvalues(frame):
|
|
"""Get information about arguments passed into a particular frame.
|
|
|
|
A tuple of four things is returned: (args, varargs, varkw, locals).
|
|
'args' is a list of the argument names.
|
|
'varargs' and 'varkw' are the names of the * and ** arguments or None.
|
|
'locals' is the locals dictionary of the given frame."""
|
|
args, varargs, varkw = getargs(frame.f_code)
|
|
return ArgInfo(args, varargs, varkw, frame.f_locals)
|
|
|
|
def formatannotation(annotation, base_module=None):
|
|
if isinstance(annotation, type):
|
|
if annotation.__module__ in ('builtins', base_module):
|
|
return annotation.__name__
|
|
return annotation.__module__+'.'+annotation.__name__
|
|
return repr(annotation)
|
|
|
|
def formatannotationrelativeto(object):
|
|
module = getattr(object, '__module__', None)
|
|
def _formatannotation(annotation):
|
|
return formatannotation(annotation, module)
|
|
return _formatannotation
|
|
|
|
def formatargspec(args, varargs=None, varkw=None, defaults=None,
|
|
kwonlyargs=(), kwonlydefaults={}, annotations={},
|
|
formatarg=str,
|
|
formatvarargs=lambda name: '*' + name,
|
|
formatvarkw=lambda name: '**' + name,
|
|
formatvalue=lambda value: '=' + repr(value),
|
|
formatreturns=lambda text: ' -> ' + text,
|
|
formatannotation=formatannotation):
|
|
"""Format an argument spec from the values returned by getargspec
|
|
or getfullargspec.
|
|
|
|
The first seven arguments are (args, varargs, varkw, defaults,
|
|
kwonlyargs, kwonlydefaults, annotations). The other five arguments
|
|
are the corresponding optional formatting functions that are called to
|
|
turn names and values into strings. The last argument is an optional
|
|
function to format the sequence of arguments."""
|
|
def formatargandannotation(arg):
|
|
result = formatarg(arg)
|
|
if arg in annotations:
|
|
result += ': ' + formatannotation(annotations[arg])
|
|
return result
|
|
specs = []
|
|
if defaults:
|
|
firstdefault = len(args) - len(defaults)
|
|
for i, arg in enumerate(args):
|
|
spec = formatargandannotation(arg)
|
|
if defaults and i >= firstdefault:
|
|
spec = spec + formatvalue(defaults[i - firstdefault])
|
|
specs.append(spec)
|
|
if varargs is not None:
|
|
specs.append(formatvarargs(formatargandannotation(varargs)))
|
|
else:
|
|
if kwonlyargs:
|
|
specs.append('*')
|
|
if kwonlyargs:
|
|
for kwonlyarg in kwonlyargs:
|
|
spec = formatargandannotation(kwonlyarg)
|
|
if kwonlydefaults and kwonlyarg in kwonlydefaults:
|
|
spec += formatvalue(kwonlydefaults[kwonlyarg])
|
|
specs.append(spec)
|
|
if varkw is not None:
|
|
specs.append(formatvarkw(formatargandannotation(varkw)))
|
|
result = '(' + ', '.join(specs) + ')'
|
|
if 'return' in annotations:
|
|
result += formatreturns(formatannotation(annotations['return']))
|
|
return result
|
|
|
|
def formatargvalues(args, varargs, varkw, locals,
|
|
formatarg=str,
|
|
formatvarargs=lambda name: '*' + name,
|
|
formatvarkw=lambda name: '**' + name,
|
|
formatvalue=lambda value: '=' + repr(value)):
|
|
"""Format an argument spec from the 4 values returned by getargvalues.
|
|
|
|
The first four arguments are (args, varargs, varkw, locals). The
|
|
next four arguments are the corresponding optional formatting functions
|
|
that are called to turn names and values into strings. The ninth
|
|
argument is an optional function to format the sequence of arguments."""
|
|
def convert(name, locals=locals,
|
|
formatarg=formatarg, formatvalue=formatvalue):
|
|
return formatarg(name) + formatvalue(locals[name])
|
|
specs = []
|
|
for i in range(len(args)):
|
|
specs.append(convert(args[i]))
|
|
if varargs:
|
|
specs.append(formatvarargs(varargs) + formatvalue(locals[varargs]))
|
|
if varkw:
|
|
specs.append(formatvarkw(varkw) + formatvalue(locals[varkw]))
|
|
return '(' + ', '.join(specs) + ')'
|
|
|
|
def _missing_arguments(f_name, argnames, pos, values):
|
|
names = [repr(name) for name in argnames if name not in values]
|
|
missing = len(names)
|
|
if missing == 1:
|
|
s = names[0]
|
|
elif missing == 2:
|
|
s = "{} and {}".format(*names)
|
|
else:
|
|
tail = ", {} and {}".format(names[-2:])
|
|
del names[-2:]
|
|
s = ", ".join(names) + tail
|
|
raise TypeError("%s() missing %i required %s argument%s: %s" %
|
|
(f_name, missing,
|
|
"positional" if pos else "keyword-only",
|
|
"" if missing == 1 else "s", s))
|
|
|
|
def _too_many(f_name, args, kwonly, varargs, defcount, given, values):
|
|
atleast = len(args) - defcount
|
|
kwonly_given = len([arg for arg in kwonly if arg in values])
|
|
if varargs:
|
|
plural = atleast != 1
|
|
sig = "at least %d" % (atleast,)
|
|
elif defcount:
|
|
plural = True
|
|
sig = "from %d to %d" % (atleast, len(args))
|
|
else:
|
|
plural = len(args) != 1
|
|
sig = str(len(args))
|
|
kwonly_sig = ""
|
|
if kwonly_given:
|
|
msg = " positional argument%s (and %d keyword-only argument%s)"
|
|
kwonly_sig = (msg % ("s" if given != 1 else "", kwonly_given,
|
|
"s" if kwonly_given != 1 else ""))
|
|
raise TypeError("%s() takes %s positional argument%s but %d%s %s given" %
|
|
(f_name, sig, "s" if plural else "", given, kwonly_sig,
|
|
"was" if given == 1 and not kwonly_given else "were"))
|
|
|
|
def getcallargs(func, *positional, **named):
|
|
"""Get the mapping of arguments to values.
|
|
|
|
A dict is returned, with keys the function argument names (including the
|
|
names of the * and ** arguments, if any), and values the respective bound
|
|
values from 'positional' and 'named'."""
|
|
spec = getfullargspec(func)
|
|
args, varargs, varkw, defaults, kwonlyargs, kwonlydefaults, ann = spec
|
|
f_name = func.__name__
|
|
arg2value = {}
|
|
|
|
|
|
if ismethod(func) and func.__self__ is not None:
|
|
# implicit 'self' (or 'cls' for classmethods) argument
|
|
positional = (func.__self__,) + positional
|
|
num_pos = len(positional)
|
|
num_args = len(args)
|
|
num_defaults = len(defaults) if defaults else 0
|
|
|
|
n = min(num_pos, num_args)
|
|
for i in range(n):
|
|
arg2value[args[i]] = positional[i]
|
|
if varargs:
|
|
arg2value[varargs] = tuple(positional[n:])
|
|
possible_kwargs = set(args + kwonlyargs)
|
|
if varkw:
|
|
arg2value[varkw] = {}
|
|
for kw, value in named.items():
|
|
if kw not in possible_kwargs:
|
|
if not varkw:
|
|
raise TypeError("%s() got an unexpected keyword argument %r" %
|
|
(f_name, kw))
|
|
arg2value[varkw][kw] = value
|
|
continue
|
|
if kw in arg2value:
|
|
raise TypeError("%s() got multiple values for argument %r" %
|
|
(f_name, kw))
|
|
arg2value[kw] = value
|
|
if num_pos > num_args and not varargs:
|
|
_too_many(f_name, args, kwonlyargs, varargs, num_defaults,
|
|
num_pos, arg2value)
|
|
if num_pos < num_args:
|
|
req = args[:num_args - num_defaults]
|
|
for arg in req:
|
|
if arg not in arg2value:
|
|
_missing_arguments(f_name, req, True, arg2value)
|
|
for i, arg in enumerate(args[num_args - num_defaults:]):
|
|
if arg not in arg2value:
|
|
arg2value[arg] = defaults[i]
|
|
missing = 0
|
|
for kwarg in kwonlyargs:
|
|
if kwarg not in arg2value:
|
|
if kwarg in kwonlydefaults:
|
|
arg2value[kwarg] = kwonlydefaults[kwarg]
|
|
else:
|
|
missing += 1
|
|
if missing:
|
|
_missing_arguments(f_name, kwonlyargs, False, arg2value)
|
|
return arg2value
|
|
|
|
# -------------------------------------------------- stack frame extraction
|
|
|
|
Traceback = namedtuple('Traceback', 'filename lineno function code_context index')
|
|
|
|
def getframeinfo(frame, context=1):
|
|
"""Get information about a frame or traceback object.
|
|
|
|
A tuple of five things is returned: the filename, the line number of
|
|
the current line, the function name, a list of lines of context from
|
|
the source code, and the index of the current line within that list.
|
|
The optional second argument specifies the number of lines of context
|
|
to return, which are centered around the current line."""
|
|
if istraceback(frame):
|
|
lineno = frame.tb_lineno
|
|
frame = frame.tb_frame
|
|
else:
|
|
lineno = frame.f_lineno
|
|
if not isframe(frame):
|
|
raise TypeError('{!r} is not a frame or traceback object'.format(frame))
|
|
|
|
filename = getsourcefile(frame) or getfile(frame)
|
|
if context > 0:
|
|
start = lineno - 1 - context//2
|
|
try:
|
|
lines, lnum = findsource(frame)
|
|
except IOError:
|
|
lines = index = None
|
|
else:
|
|
start = max(start, 1)
|
|
start = max(0, min(start, len(lines) - context))
|
|
lines = lines[start:start+context]
|
|
index = lineno - 1 - start
|
|
else:
|
|
lines = index = None
|
|
|
|
return Traceback(filename, lineno, frame.f_code.co_name, lines, index)
|
|
|
|
def getlineno(frame):
|
|
"""Get the line number from a frame object, allowing for optimization."""
|
|
# FrameType.f_lineno is now a descriptor that grovels co_lnotab
|
|
return frame.f_lineno
|
|
|
|
def getouterframes(frame, context=1):
|
|
"""Get a list of records for a frame and all higher (calling) frames.
|
|
|
|
Each record contains a frame object, filename, line number, function
|
|
name, a list of lines of context, and index within the context."""
|
|
framelist = []
|
|
while frame:
|
|
framelist.append((frame,) + getframeinfo(frame, context))
|
|
frame = frame.f_back
|
|
return framelist
|
|
|
|
def getinnerframes(tb, context=1):
|
|
"""Get a list of records for a traceback's frame and all lower frames.
|
|
|
|
Each record contains a frame object, filename, line number, function
|
|
name, a list of lines of context, and index within the context."""
|
|
framelist = []
|
|
while tb:
|
|
framelist.append((tb.tb_frame,) + getframeinfo(tb, context))
|
|
tb = tb.tb_next
|
|
return framelist
|
|
|
|
def currentframe():
|
|
"""Return the frame of the caller or None if this is not possible."""
|
|
return sys._getframe(1) if hasattr(sys, "_getframe") else None
|
|
|
|
def stack(context=1):
|
|
"""Return a list of records for the stack above the caller's frame."""
|
|
return getouterframes(sys._getframe(1), context)
|
|
|
|
def trace(context=1):
|
|
"""Return a list of records for the stack below the current exception."""
|
|
return getinnerframes(sys.exc_info()[2], context)
|
|
|
|
|
|
# ------------------------------------------------ static version of getattr
|
|
|
|
_sentinel = object()
|
|
|
|
def _static_getmro(klass):
|
|
return type.__dict__['__mro__'].__get__(klass)
|
|
|
|
def _check_instance(obj, attr):
|
|
instance_dict = {}
|
|
try:
|
|
instance_dict = object.__getattribute__(obj, "__dict__")
|
|
except AttributeError:
|
|
pass
|
|
return dict.get(instance_dict, attr, _sentinel)
|
|
|
|
|
|
def _check_class(klass, attr):
|
|
for entry in _static_getmro(klass):
|
|
if _shadowed_dict(type(entry)) is _sentinel:
|
|
try:
|
|
return entry.__dict__[attr]
|
|
except KeyError:
|
|
pass
|
|
return _sentinel
|
|
|
|
def _is_type(obj):
|
|
try:
|
|
_static_getmro(obj)
|
|
except TypeError:
|
|
return False
|
|
return True
|
|
|
|
def _shadowed_dict(klass):
|
|
dict_attr = type.__dict__["__dict__"]
|
|
for entry in _static_getmro(klass):
|
|
try:
|
|
class_dict = dict_attr.__get__(entry)["__dict__"]
|
|
except KeyError:
|
|
pass
|
|
else:
|
|
if not (type(class_dict) is types.GetSetDescriptorType and
|
|
class_dict.__name__ == "__dict__" and
|
|
class_dict.__objclass__ is entry):
|
|
return class_dict
|
|
return _sentinel
|
|
|
|
def getattr_static(obj, attr, default=_sentinel):
|
|
"""Retrieve attributes without triggering dynamic lookup via the
|
|
descriptor protocol, __getattr__ or __getattribute__.
|
|
|
|
Note: this function may not be able to retrieve all attributes
|
|
that getattr can fetch (like dynamically created attributes)
|
|
and may find attributes that getattr can't (like descriptors
|
|
that raise AttributeError). It can also return descriptor objects
|
|
instead of instance members in some cases. See the
|
|
documentation for details.
|
|
"""
|
|
instance_result = _sentinel
|
|
if not _is_type(obj):
|
|
klass = type(obj)
|
|
dict_attr = _shadowed_dict(klass)
|
|
if (dict_attr is _sentinel or
|
|
type(dict_attr) is types.MemberDescriptorType):
|
|
instance_result = _check_instance(obj, attr)
|
|
else:
|
|
klass = obj
|
|
|
|
klass_result = _check_class(klass, attr)
|
|
|
|
if instance_result is not _sentinel and klass_result is not _sentinel:
|
|
if (_check_class(type(klass_result), '__get__') is not _sentinel and
|
|
_check_class(type(klass_result), '__set__') is not _sentinel):
|
|
return klass_result
|
|
|
|
if instance_result is not _sentinel:
|
|
return instance_result
|
|
if klass_result is not _sentinel:
|
|
return klass_result
|
|
|
|
if obj is klass:
|
|
# for types we check the metaclass too
|
|
for entry in _static_getmro(type(klass)):
|
|
if _shadowed_dict(type(entry)) is _sentinel:
|
|
try:
|
|
return entry.__dict__[attr]
|
|
except KeyError:
|
|
pass
|
|
if default is not _sentinel:
|
|
return default
|
|
raise AttributeError(attr)
|
|
|
|
|
|
GEN_CREATED = 'GEN_CREATED'
|
|
GEN_RUNNING = 'GEN_RUNNING'
|
|
GEN_SUSPENDED = 'GEN_SUSPENDED'
|
|
GEN_CLOSED = 'GEN_CLOSED'
|
|
|
|
def getgeneratorstate(generator):
|
|
"""Get current state of a generator-iterator.
|
|
|
|
Possible states are:
|
|
GEN_CREATED: Waiting to start execution.
|
|
GEN_RUNNING: Currently being executed by the interpreter.
|
|
GEN_SUSPENDED: Currently suspended at a yield expression.
|
|
GEN_CLOSED: Execution has completed.
|
|
"""
|
|
if generator.gi_running:
|
|
return GEN_RUNNING
|
|
if generator.gi_frame is None:
|
|
return GEN_CLOSED
|
|
if generator.gi_frame.f_lasti == -1:
|
|
return GEN_CREATED
|
|
return GEN_SUSPENDED
|