python全局变量__name__(一个新手问题)

概述我第一次启动 python shell时有以下名称是什么？它们看起来不像__builtins__中的函数： >>> dir(__name__)['__add__', '__class__', '__contains__', '__delattr__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__ge 我第一次启动 python shell时有以下名称是什么？它们看起来不像__builtins__中的函数：

>>> dir(__name__)['__add__','__class__','__contains__','__delattr__','__doc__','__eq__','__format__','__ge__','__getattribute__','__getitem__','__getnewargs__','__getslice__','__gt__','__hash__','__init__','__le__','__len__','__lt__','__mod__','__mul__','__ne__','__new__','__reduce__','__reduce_ex__','__repr__','__rmod__','__rmul__','__setattr__','__sizeof__','__str__','__subclasshook__','_formatter_fIEld_name_split','_formatter_parser','cAPItalize','center','count','decode','encode','endswith','expandtabs','find','format','index','isalnum','isAlpha','isdigit','islower','isspace','isTitle','isupper','join','ljust','lower','lstrip','partition','replace','rfind','rindex','rjust','rpartition','rsplit','rstrip','split','splitlines','startswith','strip','swapcase','Title','translate','upper','zfill']

解决方法 __name__是一个字符串,它是一个字符串方法.它是模块的名称或顶层的’__main__’.因此,这个成语经常出现：

if __name__ == '__main__':    # this file was called directly,not imported    main()

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