Role Python __name __ = "__ main__" of

The statement added to the final module, allows the module that can be import others, and can be run directly.
fibo.py file:

def fibo():
    pass # fibo函数的内容
if __name__=="__main__":
    import sys
    fib(int(sys.arv[1]))

Then you can run the command line:

python fibo.py 50

The result is:
0112358132134

But when run another script:

import fibo

When the final statement will not be executed.
It can often be used for measurement.