#!/usr/bin/env python#coding:utf-8'''Program:    User login, three chances after the wrong    There have some manages for user logonHistory:2017.03.29      liuting      First release'''import getpassimport osfrom datetime import datetimef=open("login_time.txt","r")login_time = f.read()dic = {"student":"student","root":"westos","lt":"zq"}dic_time = {"username":"login_time"}username = raw_input("Please input the username:")login_time_now = datetime.now()a = datetime.strptime(str(login_time_now),"%Y-%m-%d %H:%M:%S.%f")b = datetime.strptime(str(login_time),"%Y-%m-%d %H:%M:%S.%f")x = (a-b).secondsif dic.has_key(username) == False:    print "The user not exist!"elif x <= 14400:    print "You already logged in at:%s\n" %(login_time)else:    for i in range(0,3):        password = getpass.getpass("Please input the password:")        if  password == dic.get(username):            print "Login success!"            print "Last login time: %s" %(str(login_time))            f=open("login_time.txt","w")            f.write(datetime.now())            f.close()            break        elif i == 2:            print "Sorry,Please login again."        else:            print "Password error,try again."            print "%d time(s) for input" %(2-i)while username == "root":    operation = raw_input(" D(delete user)\n S(show usermessage)\n A(add user)\n L(list existing user)\n q(quit)\n What operation do you want:\n")    if operation == "D":        name = raw_input("Please input the username youwant to delete:")        if dic.has_key(name) == True:            dic.pop(name)            print "Delete success!"        else:            print "The user not exist!"    elif operation == "S":        name = raw_input("Please input the username you want to see:")        print "password:%s\n login_time:%s\n **************************" %(dic.get(name,"The user not exist"),dic_time.get(name))    elif operation == "A":        name = raw_input("Please input the username you want to add:")        for i in range(0,3):            passwd_first = getpass.getpass("Please input a password:")            passwd_second = getpass.getpass("Please input the password again:")            if passwd_first == passwd_second:                dic[name] = passwd_first                print "Useradd success!\n **************************"                break            elif i == 2:                print "Please useradd again.\n \n"            else:                print "Password input different,try again!\n %d times for you!\n \n" %(2 - i)    elif operation == "L":        print "Existing user:\n %s\n **************************" %(dic.keys())    elif operation == "q":        break    else:        print "Unknown operation!\n \n"