Answers for "if __name__ == '__main__': python"

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()

if __name__ == '__main__'

if __name__ == "__main__":

__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

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

explained if name main python

# Suppose this is foo.py.

print("before import")
import math

print("before functionA")
def functionA():
    print("Function A")

print("before functionB")
def functionB():
    print("Function B {}".format(math.sqrt(100)))

print("before __name__ guard")
if __name__ == '__main__':
    functionA()
    functionB()
print("after __name__ guard")

python __main__

1from time import sleep
 2
 3print("This is my file to demonstrate best practices.")
 4
 5def process_data(data):
 6    print("Beginning data processing...")
 7    modified_data = data + " that has been modified"
 8    sleep(3)
 9    print("Data processing finished.")
10    return modified_data
11
12def read_data_from_web():
13    print("Reading data from the Web")
14    data = "Data from the web"
15    return data
16
17def write_data_to_database(data):
18    print("Writing data to a database")
19    print(data)
20
21def main():
22    data = read_data_from_web()
23    modified_data = process_data(data)
24    write_data_to_database(modified_data)
25
26if __name__ == "__main__":
27    main()