如何解决“标识符中的无效字符”？

Question

“标识符中的无效字符”

我正在 macOS Catalina 上的 IDLE 3 中运行一个包含给定代码的 python 文件。每当我运行代码时，它都会显示错误。我无法理解原因。可以的话请guide me。

错误显示在 第 11 行 charList
如果我从 makeList() 函数的第 9,10 行删除注释，则错误出现在 第 10 行

我听说过双引号的问题，但这不是这里的问题。

注意：我正在关注 Peter Farrell 的《Math Adventures With Python》一书，第 12 章

import random

target = "I never go back on my word, because that is my Ninja way."
characters = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.',?!"


#function to create a "guess" list of characters the same length as target.
def makeList():
    '''Returns a list of characters the same length
    as the target'''
    charList = [] #empty list to fill with random characters
    for i in range(len(target)):
        charList.append(random.choice(characters))
    return charList

#function to "score" the guess list by comparing it to target
def score(mylist):
    '''Returns one integer: the number of matches with target'''
    matches = 0
    for i in range(len(target)):
        if mylist[i] == target[i]:
            matches += 1
    return matches

#function to "mutate" a list by randomly changing one letter
def mutate(mylist):
    '''Returns mylist with one letter changed'''
    newlist = list(mylist)
    new_letter = random.choice(characters)
    index = random.randint(0,len(target)-1)
    newlist[index] = new_letter
    return newlist

#create a list, set the list to be the bestList
#set the score of bestList to be the bestScore
random.seed()
bestList = makeList()
bestScore = score(bestList)

guesses = 0

#make an infinite loop that will create a mutation
#of the bestList, score it
while True:
    guess = mutate(bestList)
    guessScore = score(guess)
    guesses += 1

#if the score of the newList is lower than the bestList,
“
#create a list, set the list to be the bestList
#set the score of bestList to be the bestScore
random.seed()
bestList = makeList()
bestScore = score(bestList)

guesses = 0

#make an infinite loop that will create a mutation
#of the bestList, score it
while True:
    guess = mutate(bestList)
    guessScore = score(guess)
    guesses += 1

#if the score of the newList is lower than the bestList,
#"continue" on to the next iteration of the loop
    if guessScore <= bestScore:
        continue

#if the score of the newlist is the optimal score,
#print the list and break out of the loop
    print(''.join(guess),guessScore,guesses)
    if guessScore == len(target):
        break

#otherwise, set the bestList to the value of the newList
#and the bestScore to be the value of the score of the newList
    bestList = list(guess)
    bestScore = guessScore

Answer 1

这一行：

    charList = [] #empty list to fill with random characters

所有后续行都使用non-breaking spaces 而不是常规空格。大概是您从某个源（可能是网络浏览器或文字处理器）复制/粘贴了您的代码，这些源引入了 Python 无法识别的那个和其他花哨的字符（例如两个 cmets 之间的“）。

如果您删除该行上的空格并将它们重新键入为普通空格，则该行将起作用。但是，您的代码中有一百多个后续不间断空格，因此您可能应该从头开始，或者在代码编辑器中进行搜索和替换。

Answer 2

如我所见，错误是由第 48 行引起的，您在代码中只写了双引号 (“)。