用另一个字符串替换python列表中的字符串

Question

目前我的循环停止在用答案替换1。 如何循环它，使它用4个答案替换所有4个空格？你知道吗

easyQuiz = "There are ___1___ countries in the world. The countries with the biggest landmass is ___2___. The coldest continent in the world is ___3___. ___4___ is the capital of China"

blanks = ["___1___","___2___","___3___","___4___"]

easyAnswer = ["195","Russia","Antartica","Beijing"]

#asks users to choose difficulty level
question = raw_input("Shall we start? Easy, Medium, Hard?")


if question == "Easy" or question == "easy":
    answerChoice = easyAnswer

answerChoice = answerList(question)
newprompt = []
newlist = []
index = 0
maxblanks = 3

for quizwords in difficulty(question).split():

    if quizwords == "1" :
        quizwords = quizwords.replace("1",answerChoice[index])


    elif quizwords == "2" :
        quizwords = quizwords.replace("2",answerChoice[index])

        index = index + 1
    newlist.append(quizwords)
    joinedlist = " ".join(newlist)

Answer 1

可以使用字符串格式

def easyQuiz(vals):
      return """
There are {} countries in the world.
The countries with the biggest landmass is {}.
The coldest continent in the world is {}.
{} is the capital of China""".format(*vals)

print(easyQuiz(("___1___","___2___","___3___","___4___")))
# There are ___1___ countries in the world.
# The countries with the biggest landmass is ___2___.
# The coldest continent in the world is ___3___.
# ___4___ is the capital of China

print(easyQuiz(("195","Russia","Antartica","Beijing")))
# There are 195 countries in the world.
# The countries with the biggest landmass is Russia.
# The coldest continent in the world is Antartica.
# Beijing is the capital of China

Answer 2

可以将字符串格式与regex一起使用：

import re
easyQuiz = "There are ___1___ countries in the world. The countries with the biggest landmass is ___2___. The coldest continent in the world is ___3___. ___4___ is the capital of China"
easyAnswer = ["195","Russia","Antartica","Beijing"]
answers = re.sub('___\d+___', '{}', easyQuiz).format(*easyAnswer)

输出：

'There are 195 countries in the world. The countries with the biggest landmass is Russia. The coldest continent in the world is Antartica. Beijing is the capital of China'

Answer 3

你可以zip循环中的blanks与相应的easyAnswer和replace循环。你知道吗

for blank, answer in zip(blanks, easyAnswer):
    easyQuiz = easyQuiz.replace(blank, answer)

或zip到dict并将re.sub与回调一起使用：

answer_dict = dict(zip(blanks, easyAnswer))
result = re.sub("___\d___", lambda m: answer_dict[m.group()], easyQuiz)