PYTHON

python main

# if __name__ == '__main__' checks if a file is imported as a module or not.
# example: 
def main():
    print('Hello World')
    
if __name__ == '__main__':
    # This code won't run if this file is imported.
    main()

main function python

print("Hello")

print("__name__ value: ", __name__)


def main():
    print("python main function")


if __name__ == '__main__':
    main()

python main

# Python program to execute
# main directly
print ("Always executed")
 
if __name__ == "__main__":
    print ("Executed when invoked directly")
else:
    print ("Executed when imported")

__main__(python)

<class '__main__.CoolClass'>