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SF bug #940579: section 5.10: 'not' returns boolean, not int

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Raymond Hettinger 2004-04-23 17:11:47 +00:00
parent 602472215b
commit 46a16f297f
1 changed files with 4 additions and 4 deletions
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Doc/ref/ref5.tex
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@ -977,8 +977,8 @@ as false: \code{None}, numeric zero of all types, empty sequences
(strings, tuples and lists), and empty mappings (dictionaries). All (strings, tuples and lists), and empty mappings (dictionaries). All
other values are interpreted as true. other values are interpreted as true.
The operator \keyword{not} yields \code{1} if its argument is false, The operator \keyword{not} yields \code{True} if its argument is false,
\code{0} otherwise. \code{False} otherwise.
\opindex{not} \opindex{not}
The expression \code{\var{x} and \var{y}} first evaluates \var{x}; if The expression \code{\var{x} and \var{y}} first evaluates \var{x}; if
@ -992,13 +992,13 @@ evaluated and the resulting value is returned.
\opindex{or} \opindex{or}
(Note that neither \keyword{and} nor \keyword{or} restrict the value (Note that neither \keyword{and} nor \keyword{or} restrict the value
and type they return to \code{0} and \code{1}, but rather return the and type they return to \code{False} and \code{True}, but rather return the
last evaluated argument. last evaluated argument.
This is sometimes useful, e.g., if \code{s} is a string that should be This is sometimes useful, e.g., if \code{s} is a string that should be
replaced by a default value if it is empty, the expression replaced by a default value if it is empty, the expression
\code{s or 'foo'} yields the desired value. Because \keyword{not} has to \code{s or 'foo'} yields the desired value. Because \keyword{not} has to
invent a value anyway, it does not bother to return a value of the invent a value anyway, it does not bother to return a value of the
same type as its argument, so e.g., \code{not 'foo'} yields \code{0}, same type as its argument, so e.g., \code{not 'foo'} yields \code{False},
not \code{''}.) not \code{''}.)
\section{Lambdas\label{lambdas}} \section{Lambdas\label{lambdas}}