問題描述

假設(shè)有這樣一段代碼:

def demo(): a = 1 b = 0 c = a / bdef main():try: demo()except Exception as e: print(e)main()

現(xiàn)在希望在異常時(shí)不對(duì)demo函數(shù)內(nèi)的代碼做任何修改也可以獲取到demo中a和b的值。

問題解答

參考了這個(gè)問題,然后解決了。嵌套函數(shù)獲取調(diào)用函數(shù)

用全局變量 global 可以實(shí)現(xiàn)

a = b = 0def demo(): global a, b a = 1 b = 0 c = a / bdef main():try: demo()except Exception as e: print ’a: %d, b: %d’ % (a, b) print(e)main()回答3：

函數(shù)外加引用, 這是變量作用域的知識(shí)

a = Noneb = Nonedef demo(): global a, b a = 1 b = 0 c = a / bdef main(): try:demo() except Exception as e:print(e)main()print aprint b

或者把a(bǔ),b放一個(gè)字典變量里, 這樣就不需要global了

g = {'a':0,'b':0}def demo(): g[’a’] = 1; g[’b’] = 0 c = g[’a’] / g[’b’]