Python实现队列的方法

时间:2022-09-11 09:34:54

本文实例讲述了Python实现队列的方法。分享给大家供大家参考。具体实现方法如下:

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#!/usr/bin/env python
queue = []
def enQ():
  queue.append(raw_input('Enter new string: ').strip())
#调用list的列表的pop()函数.pop(0)为列表的第一个元素
def deQ():
  if len(queue) == 0:
    print 'Cannot pop from an empty queue!'
  else:
    print 'Removed [', queue.pop(0) ,']'
def viewQ():
  print queue
CMDs = {'e': enQ, 'd': deQ, 'v': viewQ}
def showmenu():
  pr = """
  (E)nqueue
  (D)equeue
  (V)iew
  (Q)uit
    Enter choice: """
  while True:
    while True:
      try:
        choice = raw_input(pr).strip()[0].lower()
      except (EOFError, KeyboardInterrupt, IndexError):
        choice = 'q'
      print '\nYou picked: [%s]' % choice
      if choice not in 'devq':
        print 'Invalid option, try again'
      else:
        break
    if choice == 'q':
      break
    CMDs[choice]()
if __name__ == '__main__':
  showmenu()

希望本文所述对大家的Python程序设计有所帮助。