Python如何防止变量在循环过程中丢失？

Question

我目前正在学习Python三天；这里有一个相当基本的程序，来自《用Python自动化无聊的东西-为Al-Sweigarts的初学者提供实用编程》一书，我自己也做了一些改进。你知道吗

import random
import sys
#
def getAnswer(answerNumber):
 if answerNumber == 1:
    return 'no'
 elif answerNumber == 2:
    return 'yes'
#
print("Yes or no questions will be answerd. To end the program, enter 'exit'")
while True:
 resposta = input ()
 if resposta == 'exit':
  print ('goodbye')
  sys.exit()
 print(getAnswer(random.randint(1, 2)))

但每次循环重新启动时，变量都会丢失，这让我很烦恼，所以如果问两次同一个问题，就可以给出不同的答案。我该怎么修？（我尝试过使用global语句，但没有成功）

Answer 1

假设您不想为同一个问题显示不同的输出。这也许对你有帮助。你知道吗

我已经把这个问题和它的答案添加到历史字典中，所以每次输入一个新问题时，它都会被存储起来，当同一个问题重复出现时，答案不会改变。这是密码。你知道吗

import random
import sys

history = {} # History Dictionary

def add_to_history(resposta, answer): # New addition
    history.update({resposta: answer})

def getAnswer(answerNumber):
 if answerNumber == 1:
    return 'no'
 elif answerNumber == 2:
    return 'yes'

print("Yes or no questions will be answerd. To end the program, enter 'exit'")

while True:

 resposta = input()
 if resposta == 'exit':
  print ('goodbye')
  sys.exit()

 # Check if the question has been answered before
 if resposta in history.keys():
     print("printing from history")
     print(history[resposta])
 # If not then create a new answer
 else:
     print("getting answer")
     answer = getAnswer(random.randint(1, 2))
     print(answer)
     add_to_history(resposta, answer)

这就是行动。你知道吗

Does the sun rise in the east?
getting answer
no
Did my program work?
getting answer
yes
Does the sun rise in the east?
printing from history
no