if __name__ == "__main__"的理解

转载自https://www.cnblogs.com/lesleysbw/p/5898158.html#undefined

------------以下是转载内容------------

粗略来讲，__name__是当前模块，当模块被直接运行时模块名为__main__。这句话的意思是，当模块被直接执行时，代码将运行，当模块是被导入时，代码不被运行

例如，执行one.py

# 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")

运行结果：

执行two.py:

# file two.py
import one

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

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

运行结果：