目标:

  1.编写菜单,提示用户操作选项(push,pop,view,quit)

  2.规则:定义列表,先入栈,后出栈,后入栈,先出栈

1.模拟入栈、出栈操作

>>> list1 = []
>>> list1.append('a')
>>> list1
['a']
>>> list1.append('b')
>>> list1
['a', 'b']
>>> list1.pop()
'b'
>>> list1
['a']
>>> list1.pop()
'a'
>>> list1
[]
>>>

2.编写实现模拟入栈、出栈以及查询等功能

[root@localhost python]# cat in_stack_out.py
#!/usr/bin/env python
#coding:utf8 db = []

#定义入栈函数
def push_it():
item = raw_input("item: ")
db.append(item)

#定义出栈函数
def pop_it():
if db:
print "Poped item is:", db.pop()
else:
print "\033[31;1m%s\033[0m" % ('列表为空,请选择其他选项')
#定义查询函数
def view_it():
print "\033[32;1m%s\033[0m" % db

#定义函数功能的提示菜单
def show_menu():
cmds = {
"": push_it,
"": pop_it,
"": view_it
}
prompt = '''(0) push
(1) pop
(2) view
(3) quit
Please input your choice(0/1/2/3): '''
while True:
choice = raw_input(prompt).strip()[0]
if choice not in '':
print "Invalid choice, Try Again!"
continue
if choice == '':
break
cmds[choice]() if __name__ == "__main__":
show_menu()

3.运行代码,测试效果

Python模拟入栈出栈操作-LMLPHP

05-08 15:47