我在使用 Python 字典和用户输入时遇到问题

Question

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 screentitle = "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 answersfaq = {}done = Falsewhile 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!")

Answer 1

在这两个循环中

for question in faq:  

    print("Question: {}".format(question))  

for answer in faq:  

    print("Answer: {}".format(answer)) 

您遍历字典的相同键faq。您在第一个循环中打印所有问题，然后在第二个循环中再次打印所有问题。

你应该做的是：

for question in faq:

    print("Question: {}".format(question))

    print("Answer: {}".format(faq[question]))