【python】if __name__==“__main__”判斷語句的講解

概述：舉例兩個簡單的模塊。

第一個模塊one.py

print("words outside in func in one.py")

if __name__ == "__main__":
    print("one.py is being run directly")
else:

    print("one.py is being imported into another module")

第二個模塊two.py

#coding=utf-8
import one  #當導入時該模塊即被執行


print("words in two.py")
if __name__ == '__main__':
    print("two.py is being run directly")
else:

    print("two.py is being imported into another module")

這時運行第一個模塊one.py，輸出：

words outside in func in one.py

one.py is being run directly

運行第二個模塊two.py，輸出：

words outside in func in one.py
one.py is being imported into another module
words in two.py

two.py is being run directly

概述：當本模塊直接運行時，則name爲__main__，則if判斷爲正確，執行語句。當one.py模塊是被第三方模塊調用執行時，則name爲one，不等於__main__，所以執行else中語句