Python 内置变量

Posted 2020-10-16 YM的博客

^{Python 隐藏变量}

__doc__  # 表示本文件的注释
__file__ # 表示本文件的路径  
__package__ # 导入的py文件所在的文件夹路径
__cached__ # 导入文件的缓存
__name__  #如果是主文件 __name__ = "__main__" 否则等于函数名称

#!/usr/bin/env python
# -*- coding:utf-8 -*-
"""
{
    ‘__builtins__‘: <module ‘builtins‘ (built-in)>, 
    ‘__package__‘: None,
    ‘__cached__‘: None,
    ‘__file__‘: ‘C:/Users/Administrator/PycharmProject/MyProject/myfunc/ceshi.py‘, 
    ‘__doc__‘: None, 
    ‘__name__‘: ‘__main__‘, 
    ‘__loader__‘: <_frozen_importlib_external.SourceFileLoader object at 0x0000026EC5A58978>,
    ‘__spec__‘: None}
"""

if __name__ == ‘__main__‘:
    print(__file__)
    print(__doc__)
    print(vars())

运行结果：

C:/Users/Administrator/PycharmProject/MyProject/myfunc/ceshi.py   # __file__

{   # __doc__
    ‘__builtins__‘: <module ‘builtins‘ (built-in)>, 
    ‘__package__‘: None,
    ‘__cached__‘: None,
    ‘__file__‘: ‘C:/Users/Administrator/PycharmProject/MyProject/myfunc/ceshi.py‘, 
    ‘__doc__‘: None, 
    ‘__name__‘: ‘__main__‘, 
    ‘__loader__‘: <_frozen_importlib_external.SourceFileLoader object at 0x0000026EC5A58978>,
    ‘__spec__‘: None}

# vars()
{‘__cached__‘: None, ‘__package__‘: None, ‘__doc__‘: "\n{\n    ‘__builtins__‘: <module ‘builtins‘ (built-in)>, \n    ‘__package__‘: None,\n    ‘__cached__‘: None,\n    ‘__file__‘: ‘C:/Users/Administrator/PycharmProject/MyProject/myfunc/ceshi.py‘, \n    ‘__doc__‘: None, \n    ‘__name__‘: ‘__main__‘, \n    ‘__loader__‘: <_frozen_importlib_external.SourceFileLoader object at 0x0000026EC5A58978>,\n    ‘__spec__‘: None}\n", ‘__builtins__‘: <module ‘builtins‘ (built-in)>, ‘__file__‘: ‘C:/Users/Administrator/PycharmProject/MyProject/myfunc/ceshi.py‘, ‘__loader__‘: <_frozen_importlib_external.SourceFileLoader object at 0x000002354BFB8978>, ‘__spec__‘: None, ‘__name__‘: ‘__main__‘}