if name == main python code example

Example 1: python if __main__

#Add this code to run a support module on its own.
#Great for running quick tests.

if __name__ == "__main__":
	function_that_starts_the_module_to_run_on_its_own() 
    #or
    test_function_included_in_module()

Example 2: how to define main in python

# Defining main function 
def main(): 
    print("hello World") 
  
  
# Using the special variable  
# __name__ 
if __name__=="__main__": 
    main()

Example 3: if __name__ == '__main__'

if __name__ == "__main__":

Example 4: __name__== __main__ in python

# If the python interpreter is running that module (the source file)
# as the main program, it sets the special __name__ variable to have
# a value “__main__”. If this file is being imported from another 
# module, __name__ will be set to the module’s name.
if __name__=='__main__':
  # do something

Example 5: if __name__ == '__main__': main()

print("before import")
def functionA():
    print("Function A")
def functionB():
    print(("Function B"))
print("before __name__")
if __name__ == '__main__':
    functionA()
    functionB()
print("after __name__")
#===Output===
#before import
#before __name__ guard
#Function A
#Function B
#after __name__ guard

Example 6: python if name == main example

# It's as if the interpreter inserts this at the top
# of your module when run as the main program.
__name__ = "__main__"