In [1]:

    

python3 test_main.py


    

    




This is test_main.py
test_module.__name__ is test_module
---
call test_module.func()
    This is func() in test_module.py
    __name__ is test_module

In [2]:

    

python3 test_module.py


    

    




Start if __name__ == '__main__'
call func()
    This is func() in test_module.py
    __name__ is __main__

In [3]:

    

python3 -m test_module


    

    




Start if __name__ == '__main__'
call func()
    This is func() in test_module.py
    __name__ is __main__

In [4]:

    

python3 hello.py


    

In [5]:

    

python3 hello_if_name.py


    

    




Hello!
__name__ is __main__

In [6]:

    

python3 add_module.py 1.2 3.4


    

    




4.6

In [7]:

    

python3 add_module_command.py 1.2 3.4


    

    




4.6

In [8]:

    

python3 add_module_argparse.py 1.2 3.4


    

    




4.6

In [9]:

    

python3 hello_main.py


    

    




Hello!

In [10]:

    

python3 hello_direct.py


    

    




Hello!