如何列出ArgumentParser实例中的所有已注册参数? [英] How can I list all registered arguments from an ArgumentParser instance?

问题描述

找不到任何现有的方法，所以我想知道是否有黑客入侵吗?

Couldn't find any existing method for it so I wonder if there is a hack?

推荐答案

有一个hack；您可以使用未记录的属性 parser._actions :

There is a hack; you can list all registered actions using the undocumented attribute parser._actions:

>>> import argparse
>>> parser = argparse.ArgumentParser()
>>> parser.add_argument('--foo')
_StoreAction(option_strings=['--foo'], dest='foo', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None)
>>> parser.add_argument('--bar')
_StoreAction(option_strings=['--bar'], dest='bar', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None)
>>> parser.add_argument('spam')
_StoreAction(option_strings=[], dest='spam', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None)
>>> parser.add_argument('eggs')
_StoreAction(option_strings=[], dest='eggs', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None)
>>> parser._actions
[_HelpAction(option_strings=['-h', '--help'], dest='help', nargs=0, const=None, default='==SUPPRESS==', type=None, choices=None, help='show this help message and exit', metavar=None), _StoreAction(option_strings=['--foo'], dest='foo', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None), _StoreAction(option_strings=['--bar'], dest='bar', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None), _StoreAction(option_strings=[], dest='spam', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None), _StoreAction(option_strings=[], dest='eggs', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None)]

使用该属性的风险由您自己承担；这些内部结构可能会在将来的版本中更改.

Using the attribute is at your own risk; these internals are subject to change in future versions.

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