我在处理这段代码时遇到了问题。基本上我要求用户输入一个问题，然后它要求用户回答。这些都存储在字典中。我能够存储问题，但是当通过输入 #1 来回忆答案时，它会返回问题两次。知道为什么吗？
#start title screen
title = "Frequently Asked Questions"
print()
print("=" * len(title))
print(title)
print("=" * len(title))
print()
#start menu list
menu = """
0: Exit
1: List FAQ's
2: Add FAQ
3: Delete FAQ
"""
#title for selection #1
def faq_title():
print("Frequently Asked Questions:")
print("===========================")
#empty dictionary to be filled with user input questions and answers
faq = {}
done = False
while not done:
print(menu)
#enter a choice number
selection = input("Please enter a choice: ")
print()
# if user enters #0 then quits
if selection == "0":
done = True
#if user enters #1, gets list from dictionary named "faq"
elif selection == "1":
faq_title()
for question in faq:
print("Question: {}".format(question))
for answer in faq:
print("Answer: {}".format(answer))
#if user enters #2, user enters a question and then an answer which is to be stored into "faq" dictionary
#user can add as many Q&A as they want to be stored in "faq" dictionary
elif selection == "2":
question = input("Please enter the question: ")
answer = input("Please enter the answer: ")
if question in faq:
print('That question is already listed. Enter another question.')
else:
faq[question] = answer
print('Has been added to the dictionary.')
#if user enter #3, user enters a question to be deleted from the list.
#if list is empty or not in list, then return could not find
elif selection == "3":
delete = input("Please enter the question to be deleted:")
if delete in faq:
del faq[question]
if delete not in faq:
print("Could not find {} in the FAQ's:".format(delete))
print("No changes made")
print("Done!")
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