python3 模块内置变量

d:\PythonStudy\seven>python c10.py
['__annotations__', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__']

'''
asdads
'''
print(__name__)                 //打印出完整的 命名空间
print(__package__)              //包
print(__doc__)                  //注释
print(__file__)                 //文件路径

print(__name__)
print(__package__)
print(__doc__)
print(__file__)

d:\PythonStudy\seven\t>python c9.py
__main__
None
None
c9.py

c9.py
print(__name__)
print(__package__)
print(__doc__)
print(__file__)

c10.py
import t.c9

d:\PythonStudy\seven>python c10.py
t.c9
t
None
d:\PythonStudy\seven\t\c9.py

import sys
print(dir(sys))

__name__

__name__

__main__

if __name__ == '__main__':
print("这是入口")
print('这是模块')

__package__