mirror of https://github.com/python/cpython.git
Merge 3.2 except the massive Misc/NEWS conflict, so hand apply the NEWS entry.
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@ -923,6 +923,17 @@ was not present at the command line::
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>>> parser.parse_args(''.split())
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Namespace(foo=42)
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If the ``default`` value is a string, the parser parses the value as if it
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were a command-line argument. In particular, the parser applies any type_
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conversion argument, if provided, before setting the attribute on the
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:class:`Namespace` return value. Otherwise, the parser uses the value as is::
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>>> parser = argparse.ArgumentParser()
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>>> parser.add_argument('--length', default='10', type=int)
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>>> parser.add_argument('--width', default=10.5, type=int)
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>>> parser.parse_args()
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Namespace(length=10, width=10.5)
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For positional arguments with nargs_ equal to ``?`` or ``*``, the ``default`` value
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is used when no command-line argument was present::
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@ -961,6 +972,9 @@ types and functions can be used directly as the value of the ``type`` argument::
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>>> parser.parse_args('2 temp.txt'.split())
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Namespace(bar=<_io.TextIOWrapper name='temp.txt' encoding='UTF-8'>, foo=2)
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See the section on the default_ keyword argument for information on when the
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``type`` argument is applied to default arguments.
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To ease the use of various types of files, the argparse module provides the
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factory FileType which takes the ``mode=`` and ``bufsize=`` arguments of the
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:func:`open` function. For example, ``FileType('w')`` can be used to create a
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@ -99,6 +99,9 @@ Build
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Documentation
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-------------
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- Issue #15935: Clarification of argparse docs, re: add_argument() type and
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default arguments. Patch contributed by Chris Jerdonek.
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- Issue #11964: Document a change in v3.2 to the behavior of the indent
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parameter of json encoding operations.
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