Python内部变量与外部变量

def outer():
    x = 'outer x'
    def inner():
        x = 'inner x'
        print(x)
    inner()
    print(x) # 这里的`x`与`x = 'outer x'`处在同一个Enclosing
outer()

运行结果：

inner x

outer x

使用nonlocal

def outer():
    x = 'outer x'
    def inner():
        nonlocal x
        x = 'inner x'
        print(x)
    inner()
    print(x)
outer()