python中關於if name == 'main'

python中關於if name == ‘main’

author@jason_ql（lql0716）
http://blog.csdn.net/lql0716

---

• __name__ 是當前模塊名，當模塊被直接運行時模塊名爲 __main__。這句話的意思就是，當模塊被直接運行時，以下代碼塊將被運行，當模塊是被導入時，代碼塊不被運行。

• 示例

# file one.py
def func():
    print("func() in one.py")

print("top-level in one.py")

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

# file two.py
import one

print("top-level in two.py")
one.func()

if __name__ == "__main__":
    print("two.py is being run directly")
else:
    print("two.py is being imported into another module")

如果你執行one.py文件
python one.py
會輸出：

top-level in one.py
one.py is being run directly

如果你執行two.py文件，
python two.py
會輸出：

top-level in one.py
one.py is being imported into another module
top-level in two.py
func() in one.py
two.py is being run directly

• 參考：鏈接

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