python 错误 - unboundLocalError

Question

我是编程新手，但我喜欢自然语言(如您所见)。我正在尝试编写一个简单的程序来帮助测试法语现在时动词。但是，在这段代码中，我不断收到错误消息，因为 CorrectAnswers 显然尚未设置为全局变量。有什么想法吗!？

import random

level1=["(manger)","je mange", "tu manges", "il mange", "elle mange", "nous mangeons", "vous mangez", "ils mangent", "elles mangent"]
level2=["(boire)", "je bois", "tu bois", "il boit", "elle boit", "nous buvons", "vous buvez", "ils boivent", "elles boivent"]

correctAnswers=0
blanks = '_' * 8

def getVerb():
    verbIndex=random.randint(1,len(level1)-1)
    print (level1[verbIndex].split()[0], blanks, level1[0])
    ans=input()
    while ans==level1[verbIndex].split()[1]:
        correctAnswers=correctAnswers+1
        print ("Nice one!")
        print (correctAnswers)
        getVerb()
    else:
        print ("Bad luck!")
        getVerb()


getVerb()

Answer 1

CorrectAnswers=0 超出范围。它们应该位于 getVerb 内部。您也不需要递归。

假设您想测试每个级别和每个问题一次:

import random


level1=["(manger)","je mange", "tu manges", "il mange", "elle mange", "nous mangeons", "vous mangez", "ils mangent", "elles mangent"]
level2=["(boire)", "je bois", "tu bois", "il boit", "elle boit", "nous buvons", "vous buvez", "ils boivent", "elles boivent"]
blanks = '_' * 8

def getVerb():    
    correctAnswers = 0        

    # Do each level once
    for level in (level1, level2):
        level_name, choices = level[0], level[1:]

        # Shuffle the choices, this makes sure we only do each question once
        random.shuffle(choices)

        # Go through all the choices once
        for choice in choices:
            prefix, suffix = choice.split(' ', 2)
            print (prefix, blanks, level_name)

            ans = raw_input('Answer: ') # input() if Python 3
            while True:
                if ans == suffix:
                    correctAnswers += 1
                    print ("Nice one!")
                    print (correctAnswers)

                    # Got the right answer, break out
                    break
                else:
                    print ("Bad luck!")
                    # Change prompt to "Try again" on failure
                    ans = raw_input('Try again: ') # input() if Python 3


getVerb()

如果您可以通过预分割部分或使用字典来控制 level1/level2 输入，则可以对此进行更多优化。