http://hg.python.org/cpython/rev/d832756a82d9 changeset: 68978:d832756a82d9 parent: 68976:a76257a99636 parent: 68977:423b50086b67 user: Steven Bethard <steven.bethard@gmail.com> date: Sat Mar 26 19:55:36 2011 +0100 summary: Issue #8982: Improve the documentation for the argparse Namespace object. (Merge from 3.2.) files: Doc/library/argparse.rst | 21 ++++++++++++++++----- Misc/NEWS | 2 ++ 2 files changed, 18 insertions(+), 5 deletions(-) diff --git a/Doc/library/argparse.rst b/Doc/library/argparse.rst --- a/Doc/library/argparse.rst +++ b/Doc/library/argparse.rst @@ -1330,13 +1330,24 @@ Namespace(accumulate=<built-in function sum>, integers=[1, 2, 3, 4]) -Custom namespaces -^^^^^^^^^^^^^^^^^ +The Namespace object +^^^^^^^^^^^^^^^^^^^^ + +By default, :meth:`parse_args` will return a new object of type :class:`Namespace` +where the necessary attributes have been set. This class is deliberately simple, +just an :class:`object` subclass with a readable string representation. If you +prefer to have dict-like view of the attributes, you can use the standard Python +idiom via :func:`vars`:: + + >>> parser = argparse.ArgumentParser() + >>> parser.add_argument('--foo') + >>> args = parser.parse_args(['--foo', 'BAR']) + >>> vars(args) + {'foo': 'BAR'} It may also be useful to have an :class:`ArgumentParser` assign attributes to an -already existing object, rather than the newly-created :class:`Namespace` object -that is normally used. This can be achieved by specifying the ``namespace=`` -keyword argument:: +already existing object, rather than a new :class:`Namespace` object. This can +be achieved by specifying the ``namespace=`` keyword argument:: >>> class C: ... pass diff --git a/Misc/NEWS b/Misc/NEWS --- a/Misc/NEWS +++ b/Misc/NEWS @@ -299,6 +299,8 @@ - Issue #9348: Raise an early error if argparse nargs and metavar don't match. +- Issue #8982: Improve the documentation for the argparse Namespace object. + Build ----- -- Repository URL: http://hg.python.org/cpython