小编akm*_*akm的帖子

我对python如何实现闭包感兴趣？

为了举例，请考虑这个

def closure_test():
    x = 1
    def closure():
        nonlocal x
        x = 2
        print(x)
    return closure

closure_test()()

这里，该函数closure_test有一个x嵌套函数closure捕获的局部变量。

当我运行该程序时，我得到以下输出

2

当我看到函数的反汇编时closure_test，

  2           0 LOAD_CONST               1 (1)
              2 STORE_DEREF              0 (x)

  3           4 LOAD_CLOSURE             0 (x)
              6 BUILD_TUPLE              1
              8 LOAD_CONST               2 (<code object closure at 0x7f14ac3b9500, file "<string>", line 3>)
             10 LOAD_CONST               3 ('closure_test.<locals>.closure')
             12 MAKE_FUNCTION            8 (closure)
             14 STORE_FAST               0 (closure)

  7          16 LOAD_FAST                0 (closure)
             18 RETURN_VALUE

Disassembly of …