S 0en s 1en__

1. If the module is imported, the value of s 1en__ is the module name
2. If the module is to be directly executed, the value of 's s 3en__ is' s s 4en__'

Py1.py

# ! /usr/bin/env python

def test():

 print '__name__ = ',__name__

if __name__ == '__main__':

 test()

Py2.py

# ! /usr/bin/env python

import Py1.py

 

def test():

 print '__name__ = ',__name__

if __name__ == '__main__':

 test()

 print  ' Py1.py __name__ = ',Py1.__name__

Execution results:

__name__=__main__

Py1.py __name__=Py1

As can be seen from the results, Py2.py is directly executed, then the value of the built-in variable s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s = s

if __name__ == '__main__':

 test()