Python练习：简单停车场（栈）

#!/usr/bin/env python

#coding UTF-8

class  Stack:
 def __init__(self):pass
 top = -1
 arr = []
 def pop(self,arr):
  self.arr.remove(self.arr[len(self.arr)-1])
 def push(self,go_in):
  self.arr.append(go_in)

parking = Stack()
while(True):
     status=raw_input(‘In , Out or Stop‘)
     if(status==‘In‘):
      car = raw_input(‘You car?‘)
      parking.push(car)
      print ‘%s‘ %parking.arr
     if(status==‘Out‘):

      #print ‘%s is out‘ %parking.arr[len(parking.arr)-1]
      parking.pop(parking.arr)
      print ‘%s‘ %parking.arr
     if(status==‘Stop‘):
      exit()