如何从 ArgumentParser 实例中列出所有已注册的参数? [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攻击?

解决方案

有一个 hack；您可以使用未记录的属性 parser._actions 列出所有已注册的操作:

<预><代码>>>>导入参数解析>>>解析器 = argparse.ArgumentParser()>>>parser.add_argument('--foo')_StoreAction(option_strings=['--foo'], dest='foo', nargs=None, const=None, default=None, type=None, selection=None, help=None, metavar=None)>>>parser.add_argument('--bar')_StoreAction(option_strings=['--bar'], dest='bar', nargs=None, const=None, default=None, type=None, selection=None, help=None, metavar=None)>>>parser.add_argument('垃圾邮件')_StoreAction(option_strings=[], dest='spam', nargs=None, const=None, default=None, type=None, choice=None, help=None, metavar=None)>>>parser.add_argument('鸡蛋')_StoreAction(option_strings=[], dest='eggs', nargs=None, const=None, default=None, type=None, options=None, help=None, metavar=None)>>>解析器._actions[_HelpAction(option_strings=['-h', '--help'], dest='help', nargs=0, const=None, default='==SUPPRESS==', type=None, choice=None,help='显示此帮助信息并退出', metavar=None), _StoreAction(option_strings=['--foo'], dest='foo', nargs=None, const=None, default=None, type=None,选择=无，帮助=无，元变量=无)，_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, choice=None, help=None, metavar=None), _StoreAction(option_strings=[], dest='eggs', nargs=None, const=None, default=None, type=None, selection=None, help=None, metavar=None)]

使用该属性的风险由您自行承担；这些内部结构在未来版本中可能会发生变化.

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

解决方案

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)]

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

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