what is __name__ in python?

one.py

print ('top level in one.py')


def matter():
    print ('this is matter() in one.py')


if __name__ == '__main__':
    print("one.py is being run directly and __name__ is : ", __name__)
    matter()
else:
    print("one.py is being imported in another module and __name__ is : ", __name__)

output

$ python two.py
top level in one.py
('one.py is being imported in another module and __name__ is : ', 'one')
this is matter() in one.py
this is top level in two.py
('two.py is being run directly and __name__ is : ', '__main__')

two.py

import one

one.matter()

print ('this is top level in two.py')

if __name__ == '__main__':
    print("two.py is being run directly and __name__ is : ", __name__)
else:
    print("two.py is being imported in another module and __name__ is : ", __name__)