Python 我如何不断地重复；如果；s

我希望我的if函数在遇到else时在python上不断重复。我该怎么做？我添加了一个代码示例

if selection1 == "C": 
  print("Ok") 
elif selection1 == "E": 
  print("Ok") 
elif selection1 == "Q": 
  print("Ok...") quit() 
else: 
  selection1 == print("The character you entered has not been recognised, please try again.")

---

我不知道你是不是这个意思，但是这个程序完全按照你的问题所问的去做

while True:
  selection1 = input("Enter Character\n")
  if selection1 == "C": 
    print("Ok") 
  elif selection1 == "E": 
    print("Ok") 
  elif selection1 == "Q": 
    print("Ok...") 
    break 
  else: 
    selection1 == print("The character you entered has not been recognised, please try again.")

程序接收字符作为输入，并用硬编码字符进行检查。如果不匹配，它将要求用户重复，直到字母

Q

匹配为止。输出可以是

Enter Character
C
Ok
Enter Character
E
Ok
Enter Character
v
The character you entered has not been recognised, please try again.
Enter Character
Q
Ok...

---

这里有两种可能的方法

while True:   # i.e. loop until I tell you to break

    selection1 = GetSelectionFromSomewhere()

    if selection1 == 'C':
        print('Okay...')
        break
    elif selection1 == 'E':
        print('Okay...')
        break
    elif selection1 == 'Q':
        print('Okay...')
        quit()
    else:
        Complain()

一些纯粹主义者不喜欢

而真正的
循环，因为他们一眼就看不出循环条件是什么。下面是另一个列表，它的优点是将
break
语句和其他内务处理排除在
if
级联之外，这样您就可以集中精力进行必要的操作：

satisfied = False
while not satisfied:
    selection1 = GetSelectionFromSomewhere()
    satisfied = True
    if selection1 == 'C':
        print('Okay...')
    elif selection1 == 'E':
        print('Okay...')
    elif selection1 == 'Q':
        print('Okay...')
        quit()
    else:
        Complain()
        satisfied = False

但是你已经从以前的帖子中找到了答案。这只是另一种选择。
，-也有漂亮的图片
while True:   # i.e. loop until I tell you to break

    selection1 = GetSelectionFromSomewhere()

    if selection1 == 'C':
        print('Okay...')
        break
    elif selection1 == 'E':
        print('Okay...')
        break
    elif selection1 == 'Q':
        print('Okay...')
        quit()
    else:
        Complain()

satisfied = False
while not satisfied:
    selection1 = GetSelectionFromSomewhere()
    satisfied = True
    if selection1 == 'C':
        print('Okay...')
    elif selection1 == 'E':
        print('Okay...')
    elif selection1 == 'Q':
        print('Okay...')
        quit()
    else:
        Complain()
        satisfied = False

characters = {'C','E','Q'}
def check():
    ch=raw_input("type a letter: ")
    if ch == q:
        quit()
    print "ok" if ch in characters else check()
    check()