python3.x - 关于python3.5使用exec动态调用方法获取返回值的问题：单独执行好使，但是封装在class里就会报错？

Question

先提问题的场景： {代码...} 以上代码可执行 {代码...} 以上代码会报错，提示a未定义 {代码...} 以上代码显示的仍是0，而不是1 小弟想实现的是动态拼接调用方法，获取返回值的字符串，例如，动态拼接出exec_resul...

PHP中文网 · Answer

Regarding the use of exec, the questioner can refer to another question: https://segmentfault.com/q/10...

To give you a solution to your current problem:

# encoding: utf-8

class tess(object):
    def __init__(self):
        self.__globals__ = {}
        self.__locals__ = self.__globals__

    def ex(self):
        sa = 'a=1'
        exec(sa, self.__globals__, self.__locals__)
        print(self.__globals__['a'])

s = tess()
s.ex()