的Python argparse出現在gc.garbage

我想在Python應用程序調試內存泄漏，我可以看到很多屬於模塊的Python argparse出現在gc.garbage

這裏收集非對象的最小腳本複製錯誤

import gc 
gc.set_debug(gc.DEBUG_LEAK) 

def get_cli_arguments(): 
    import argparse 
    parser = argparse.ArgumentParser(description='Launch a RHM server') 
    parser.add_argument(
     '--port', 
     metavar='port', 
     type=int, 
     nargs='?', 
     help='the server port', 
     default=8003 
    ) 
    return vars(parser.parse_args()) 


def main(): 
    args = get_cli_arguments() 
    x = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" 


main() 
gc.collect() 
print(gc.garbage)

，我得到了下面的輸出

gc: collectable <dict 0x7f9a8b303c58> 
gc: collectable <dict 0x7f9a8b303d70> 
gc: collectable <list 0x7f9a8b350ea8> 
gc: collectable <list 0x7f9a8b350b00> 
gc: collectable <list 0x7f9a8b3dca70> 
gc: collectable <_ArgumentGroup 0x7f9a8b3e6250> 
gc: collectable <dict 0x7f9a8b301910> 
gc: collectable <list 0x7f9a8b3535a8> 
gc: collectable <list 0x7f9a8b3e1758> 
gc: collectable <function 0x7f9a8b3d2d70> 
gc: collectable <dict 0x7f9a8b301a28> 
gc: collectable <list 0x7f9a8b3e17e8> 
gc: collectable <_HelpAction 0x7f9a8b3e60d0> 
gc: collectable <dict 0x7f9a8b3014b0> 
gc: collectable <HelpFormatter 0x7f9a8b2f7f90> 
gc: collectable <_Section 0x7f9a8b2f7fd0> 
gc: collectable <dict 0x7f9a8b3016e0> 
gc: collectable <list 0x7f9a8b350248> 
gc: collectable <dict 0x7f9a8b3015c8> 
gc: collectable <dict 0x7f9a8b303e88> 
gc: collectable <list 0x7f9a8b3e1d40> 
gc: collectable <_StoreAction 0x7f9a8b30a090> 
gc: collectable <dict 0x7f9a8b2f9c58> 
gc: collectable <HelpFormatter 0x7f9a8b30a0d0> 
gc: collectable <_Section 0x7f9a8b30a110> 
gc: collectable <dict 0x7f9a8b3017f8> 
gc: collectable <list 0x7f9a8b36c200> 
gc: collectable <dict 0x7f9a8b301b40> 
[{'action': {'store_false': <class 'argparse._StoreFalseAction'>, 'append_const': <class 'argparse._AppendConstAction'>, 'help': <class 'argparse._HelpAction'>, None: <class 'argparse._StoreAction'>, 'store_true': <class 'argparse._StoreTrueAction'>, 'count': <class 'argparse._CountAction'>, 'store_const': <class 'argparse._StoreConstAction'>, 'version': <class 'argparse._VersionAction'>, 'store': <class 'argparse._StoreAction'>, 'parsers': <class 'argparse._SubParsersAction'>, 'append': <class 'argparse._AppendAction'>}, 'type': {None: <function identity at 0x7f9a8b3d2d70>}}, {'store_false': <class 'argparse._StoreFalseAction'>, 'append_const': <class 'argparse._AppendConstAction'>, 'help': <class 'argparse._HelpAction'>, None: <class 'argparse._StoreAction'>, 'store_true': <class 'argparse._StoreTrueAction'>, 'count': <class 'argparse._CountAction'>, 'store_const': <class 'argparse._StoreConstAction'>, 'version': <class 'argparse._VersionAction'>, 'store': <class 'argparse._StoreAction'>, 'parsers': <class 'argparse._SubParsersAction'>, 'append': <class 'argparse._AppendAction'>}, [_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=['--port'], dest='port', nargs='?', const=None, default=8003, type=<type 'int'>, choices=None, help='the server port', metavar='port')], [], [], <argparse._ArgumentGroup object at 0x7f9a8b3e6250>, {'_mutually_exclusive_groups': [], '_negative_number_matcher': <_sre.SRE_Pattern object at 0x7f9a8b437290>, 'description': None, '_option_string_actions': {'--port': _StoreAction(option_strings=['--port'], dest='port', nargs='?', const=None, default=8003, type=<type 'int'>, choices=None, help='the server port', metavar='port'), '-h': _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), '--help': _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)}, 'title': 'optional arguments', '_has_negative_number_optionals': [], '_defaults': {}, 'prefix_chars': '-', 'argument_default': None, '_registries': {'action': {'store_false': <class 'argparse._StoreFalseAction'>, 'append_const': <class 'argparse._AppendConstAction'>, 'help': <class 'argparse._HelpAction'>, None: <class 'argparse._StoreAction'>, 'store_true': <class 'argparse._StoreTrueAction'>, 'count': <class 'argparse._CountAction'>, 'store_const': <class 'argparse._StoreConstAction'>, 'version': <class 'argparse._VersionAction'>, 'store': <class 'argparse._StoreAction'>, 'parsers': <class 'argparse._SubParsersAction'>, 'append': <class 'argparse._AppendAction'>}, 'type': {None: <function identity at 0x7f9a8b3d2d70>}}, '_group_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=['--port'], dest='port', nargs='?', const=None, default=8003, type=<type 'int'>, choices=None, help='the server port', metavar='port')], '_action_groups': [], 'conflict_handler': 'error', '_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=['--port'], dest='port', nargs='?', const=None, default=8003, type=<type 'int'>, choices=None, help='the server port', metavar='port')]}, [], [_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=['--port'], dest='port', nargs='?', const=None, default=8003, type=<type 'int'>, choices=None, help='the server port', metavar='port')], <function identity at 0x7f9a8b3d2d70>, {None: <function identity at 0x7f9a8b3d2d70>}, ['-h', '--help'], _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), {'const': None, 'help': 'show this help message and exit', 'option_strings': ['-h', '--help'], 'dest': 'help', 'required': False, 'nargs': 0, 'choices': None, 'default': '==SUPPRESS==', 'container': <argparse._ArgumentGroup object at 0x7f9a8b3e6250>, 'type': None, 'metavar': None}, <argparse.HelpFormatter object at 0x7f9a8b2f7f90>, <argparse._Section object at 0x7f9a8b2f7fd0>, {'items': [], 'formatter': <argparse.HelpFormatter object at 0x7f9a8b2f7f90>, 'heading': None, 'parent': None}, [], {'_current_indent': 0, '_level': 0, '_indent_increment': 2, '_action_max_length': 0, '_max_help_position': 24, '_width': 78, '_root_section': <argparse._Section object at 0x7f9a8b2f7fd0>, '_long_break_matcher': <_sre.SRE_Pattern object at 0x7f9a8b33e258>, '_prog': 'prout.py', '_current_section': <argparse._Section object at 0x7f9a8b2f7fd0>, '_whitespace_matcher': <_sre.SRE_Pattern object at 0x7f9a8b347750>}, {'--port': _StoreAction(option_strings=['--port'], dest='port', nargs='?', const=None, default=8003, type=<type 'int'>, choices=None, help='the server port', metavar='port'), '-h': _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), '--help': _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)}, ['--port'], _StoreAction(option_strings=['--port'], dest='port', nargs='?', const=None, default=8003, type=<type 'int'>, choices=None, help='the server port', metavar='port'), {'const': None, 'help': 'the server port', 'option_strings': ['--port'], 'dest': 'port', 'required': False, 'nargs': '?', 'choices': None, 'default': 8003, 'container': <argparse._ArgumentGroup object at 0x7f9a8b3e6250>, 'type': <type 'int'>, 'metavar': 'port'}, <argparse.HelpFormatter object at 0x7f9a8b30a0d0>, <argparse._Section object at 0x7f9a8b30a110>, {'items': [], 'formatter': <argparse.HelpFormatter object at 0x7f9a8b30a0d0>, 'heading': None, 'parent': None}, [], {'_current_indent': 0, '_level': 0, '_indent_increment': 2, '_action_max_length': 0, '_max_help_position': 24, '_width': 78, '_root_section': <argparse._Section object at 0x7f9a8b30a110>, '_long_break_matcher': <_sre.SRE_Pattern object at 0x7f9a8b33e258>, '_prog': 'prout.py', '_current_section': <argparse._Section object at 0x7f9a8b30a110>, '_whitespace_matcher': <_sre.SRE_Pattern object at 0x7f9a8b347750>}]

我找不到argparse這樣一個問題的任何報告，我做錯了什麼？

來源

2016-07-20 allan.simon

此行

gc.set_debug(gc.DEBUG_LEAK)

是equivalent to saying

gc.set_debug(gc.DEBUG_COLLECTABLE | gc.DEBUG_UNCOLLECTABLE | gc.DEBUG_SAVEALL)

而且by setting DEBUG_SAVEALL，

設置時，發現將被追加到垃圾，而不是被釋放所有不可達的對象。

事實上，這些將已被釋放，有你沒有設置DEBUG_LEAK。（試試你就無需設置DEBUG_LEAK代碼）

你可能想要的標誌是gc.DEBUG_UNREACHABLE，它顯示的是不可達（和可能應該釋放）對象的信息，但不能被垃圾收集器被釋放。

您也可以查看DEBUG_COLLECTABLE以幫助確定循環引用可以將釋放。

來源

2016-07-20 10:04:40 jedwards

的Python argparse出現在gc.garbage

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