python - 如何让 raw_input 重复直到我想退出？

Question

假设我想像这样使用 raw_input:

code = raw_input("请输入您的三字母代码或空行退出:")

下:

if __name__=="__main__": 

如何让它重复多次而不是每次运行程序时只重复一次？
另一个问题是写什么代码可以满足“或者空行退出(程序)”的条件。

Answer 1

最好的:

if __name__ == '__main__':
  while True:
    entered = raw_input("Please enter your three-letter code or leave a blank line to quit: ")
    if not entered: break
    if len(entered) != 3:
      print "%r is NOT three letters, it's %d" % (entered, len(entered))
      continue
    if not entered.isalpha():
      print "%r are NOT all letters -- please enter exactly three letters, nothing else!"
      continue
    process(entered)