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Document that format string don’t support arbitrary dictonary keys.

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Text adapted from the PEP.  Addition requested by Terry J. Reedy on
2011-02-23 on python-dev.
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Éric Araujo 2011-09-01 18:59:06 +02:00
parent 8ab3a1d735
commit 29cf58c9d5
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Doc/library/string.rst
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@ -216,6 +216,8 @@ keyword. If it's a number, it refers to a positional argument, and if it's a ke
it refers to a named keyword argument. If the numerical arg_names in a format string it refers to a named keyword argument. If the numerical arg_names in a format string
are 0, 1, 2, ... in sequence, they can all be omitted (not just some) are 0, 1, 2, ... in sequence, they can all be omitted (not just some)
and the numbers 0, 1, 2, ... will be automatically inserted in that order. and the numbers 0, 1, 2, ... will be automatically inserted in that order.
Because *arg_name* is not quote-delimited, it is not possible to specify arbitrary
dictionary keys (e.g., the strings ``'10'`` or ``':-]'``) within a format string.
The *arg_name* can be followed by any number of index or The *arg_name* can be followed by any number of index or
attribute expressions. An expression of the form ``'.name'`` selects the named attribute expressions. An expression of the form ``'.name'`` selects the named
attribute using :func:`getattr`, while an expression of the form ``'[index]'`` attribute using :func:`getattr`, while an expression of the form ``'[index]'``