Python argparse erscheint in gc.garbage

Question

Ich versuche, ein Speicherleck in einer Python-Anwendung zu debuggen, und ich kann eine Menge nicht gesammelt Objekt gehört zu dem Modul argparse

hier ein minimale Skript Wiedergabe des Fehlers

sehen

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) 

und ich bekam die folgende Ausgabe

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>}] 

ich keinen Bericht eines solchen Problems in argparse finden, mache ich etwas falsch?

Answer 1

Diese Linie

gc.set_debug(gc.DEBUG_LEAK) 

Ist equivalent to saying

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

Und by setting DEBUG_SAVEALL,

Wenn gesetzt, werden alle an Müll angehängt wird eher gefunden unerreichbare Objekte als befreit zu werden.

In der Tat, diese würde befreit wurden, musste man nicht DEBUG_LEAK gesetzt. (Versuchen Sie Ihren Code ohne Einstellung)

Die Flagge, die Sie wahrscheinlich wollen, ist gc.DEBUG_UNREACHABLE, die Informationen über Objekte anzeigt, die nicht erreichbar sind (und wahrscheinlich freigegeben werden sollten), aber nicht vom Garbage Collector freigegeben werden können.

Sie könnten auch DEBUG_COLLECTABLE betrachten, um kreisförmige Referenzen zu identifizieren, die freigegeben werden können.