python 的 main method

之前看 python 文章好像都沒提到怎麼寫 main method, 似乎這件事情很自然, 不過我卻不知道.
看了 6.1.1. Executing modules as scripts 裡面有寫
"the code in the module will be executed, just as if you imported it, but with the __name__ set to "__main__". That means that by adding this code at the end of your module:"

if __name__ == "__main__":
    import sys
    fib(int(sys.argv[1]))

試著作一次

1. C:\Python33\say.py
   

   def say(words):
           print(words)
   
   if __name__ == '__main__':
           import sys
           say(sys.argv[1])
           print(__name__,sys.argv[0])
   
   

2. Output
   

   C:\Python33>python.exe say.py hello
   hello
   __main__ say.py

這樣就可以了, 很簡單..