**"Invalid character in identifier"**

I am running a python file containing the given code in IDLE 3 on macOS Catalina. Whenever i run the code, it shows an error. I am unable to understand the reason. Please `guide me` if you can.

The error is showing at **line 11 charList**

If I remove the comment from line 9,10 in makeList() function, then error comes at *line 10 for*

I have heard about the problem of double quotation but that's not the problem here.

Note: I am following the book "Math Adventures With Python" by Peter Farrell, chapter 12

```
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

```