When the interpreter reads a python script file, it does two things:

(1) set some special variable.

(2) it executes all the code from 1st line of that script file.

__name__ (2 underscores before and after) is a special python variable.

we can import this script as a module.

and also execute this script directly that the interpreter will assign the hard-coded string "__main__" to the __name__ variable

# foo.py
# I am using python 3.4


print ("Befor foo function.")

def foo():

    print ("foo function.")

print ("After foo function.")

if __name__ == "__main__":

    foo()

if we run it with

$ python foo.py

then the result is :

Befor foo function.

After foo function.

foo function.

and if we import it, then run $ python hello.py

# hello.py
import foo

the running result is:

Befor foo function.

After foo function.

總結

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