__name__

# File2.py 
  
import File1 
  
print "File2 __name__ = %s" %__name__ 
  
if __name__ == "__main__": 
    print "File2 is being run directly"
else: 
    print "File2 is being imported"

# File1.py 
  
print "File1 __name__ = %s" %__name__ 
  
if __name__ == "__main__": 
    print "File1 is being run directly"
else: 
    print "File1 is being imported"

Now the interpreter is given the command to run File1.py.
python File1.py
Output :
File1 __name__ = __main__
File1 is being run directly


And then File2.py is run.
python File2.py
Output :
File1 __name__ = File1
File1 is being imported
File2 __name__ = __main__
File2 is being run directly