/Python/What does if __name_=="_main__": do?

What does if __name_=="_main__": do?

basically,   (__name__ == '__main__') ==True

confirms file is NOT a/part of a module and may continue execution

What does if __name_=="_main__": do?

# 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")

Source: stackoverflow.com

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