礼拜的LIFO特性：

LIFO（Last In First Out）

其实就是堆栈功能，比如搭积木：

第一块在最下面，最后一块在最上面，拆的时候总是最后一块先拆，以此类推（stack）

代码实现：

#!/usr/bin/env python3# -*- coding:utf-8 -*-import sysLIFO = []def view():    print(LIFO)def push(a):    LIFO.append(a)    view()def pop():    LIFO.pop()    view()def quit():    sys.exit()while True:    choose = input("Please choose one button\n{push,pop,view,quit}\n>:")    choose = choose.upper()    if choose == "PUSH":        val = input("Enter something\n>:")        push(val)    elif choose == "POP":        pop()    elif choose == "VIEW":        view()    else:        quit()

 

允许用户创建文件与写入内容

代码：

#!/usr/bin/env python3# -*- coding:utf-8 -*-'makefile.py -- create text file'import os ; import sysls = os.linesep#循环要求输入文件名while True:    fname = input("Enter a filename(fullname): ")    if os.path.exists(fname):        print("ERROR '%s' is already exists!" % fname)    else:        break#获取文件内容all = []print("\n enter  lines('q' by itself to quit)")while True:    content = input('> ')    if content.lower() == 'q':        break    else:        all.append(content)#写入文件with open(fname, 'w') as fobj:    fobj.writelines(['%s%s' % (x, ls) for x in all])print:"Done"