day04--作业

第一题

---

分别画出下面两个列表在内存中是如何存放的
l1=[11,22,[333,444]]
l2=[11,22,[33,{'name':'egon','age':18}]]

如下图所示

第二题

---

用户输入姓名、年龄、工作、爱好 ，然后打印成以下格式
------------ info of Egon -----------
Name  : Egon
Age   : 22
Sex   : male
Job   : Teacher
------------- end -----------------

如下：

#-*- coding:utf-8 -*-

def main():
    name = input('please enter your name:').strip()
    age = int(input('please enter your age:').strip())
    sex = input('please enter your sex:').strip()
    job = input('please enter your job:').strip()
    printinfo(name,age,sex,job)

def printinfo(name,age,sex,job):
    print('{0:-^30}'.format('info of Egon'))
    print('Name:{0}
Age:{1}
Sex:{2}
Job:{3}'.format(name,age,sex,job))
    print('{0:-^30}'.format('end'))

if __name__ == '__main__':
    main()

运行结果：

第三题

---

用户输入账号密码，程序分别单独判断账号与密码是否正确，正确输出True，错误输出False即可

 代码如下：

#!/usr/bin/env python
#-*- coding:utf-8 -*-
def main():
    tag = False
    username = input('please enter your account:').strip()
    if username == 'Egon':
        passwd = input('please enter your password:').strip()
        if passwd == 'Alex666':
            tag = True
    print(tag)

if __name__ == '__main__':
    main()

 测试用例：

[{'Egon':'Alex666'},{'Tank':'CCCDDD'},{'Egon':'VIPbnc'}]

运行结果：

[root@Kingstar test]# /usr/bin/python test_2.py 
please enter your account:Egon         
please enter your password:Alex666
True
[root@Kingstar test]#


[root@Kingstar test]# /usr/bin/python test_2.py 
please enter your account:Tank
False
[root@Kingstar test]# /usr/bin/python test_2.py 
please enter your account:Egon   
please enter your password:VIPbnc
False
[root@Kingstar test]# 

 第四题

---

让计算机提前记下egon的年龄为18岁，写一个才年龄的程序，要求用户输入所猜的年龄
，然后程序拿到用户输入的年龄与egon的年龄比较，输出比较结果即可

 代码如下：

#!/usr/bin/env python
#-*- coding:utf-8 -*-

def main():
    user_info = {'egon':18}
    guess_age = int(input('please enter the age of egon:').strip())
    if guess_age == user_info.get('egon'):
        print('猜对了！')
    elif guess_age < user_info.get('egon'):
        print('猜小了！')
    else:
        print('猜大了！')

if __name__ == '__main__':
    main()




[root@Kingstar test]# /usr/bin/python test_3.py 
please enter the age of egon:18
猜对了！
[root@Kingstar test]# /usr/bin/python test_3.py 
please enter the age of egon:19
猜大了！
[root@Kingstar test]# /usr/bin/python test_3.py 
please enter the age of egon:17
猜小了！

 第五题

---

程序从数据库中取出来10000条数据，打算显示到页面中，
但一个页面最多显示30条数据,请选取合适的算数运算符，计算
   显示满30条数据的页面总共有多少个？
   最后一页显示几条数据

 代码如下：

#!/usr/bin/env python
#-*- coding:utf-8 -*-

def main():
    num_of_data = 10000
    per_data = 30
    print(f'显示满30条数据的页面一共有{num_of_data//per_data}')
    print('最后一页显示{0}条数据'.format(num_of_data%per_data))

if __name__ == '__main__':
    main()





[root@Kingstar test]# /usr/bin/python test_4.py 
显示满30条数据的页面一共有333
最后一页显示10条数据

第六题

---

egon今年为18岁，请用增量赋值计算3年后egon老师的年龄

 代码如下：

#!/usr/bin/env python
#-*- coding:utf-8 -*-

def main():
    age = 18
    print('3年后,{0}的年龄为{1}'.format('egon',age+3))

if __name__ == '__main__':
    main(）




[root@Kingstar test]# /usr/bin/python test_5.py 
3年后,egon的年龄为21

 第七题

---

将值10一次性赋值给变量名x、y、z

>>> x=y=z=10
>>> print(x,y,z)
10 10 10
>>> 

 第八题

---

请将下面的值关联到它应该对应的变量名上，你懂的
dsb = "egon"
superman = "alex"

>>> dsb = 'egon'
>>> superman = 'alex'
>>> dsb,superman = superman,dsb
>>> print(dsb,superman)
alex egon
>>> 

 第九题

---

我们只需要将列表中的傻逼解压出来，一次性赋值给对应的变量名即可
names=['alex_sb','wusir_sb','oldboy_sb','egon_nb','lxx_nb','tank_nb']

>>> names=['alex_sb','wusir_sb','oldboy_sb','egon_nb','lxx_nb','tank_nb']
>>> x,y,z,*_=names
>>> print(x,y,z)
alex_sb wusir_sb oldboy_sb
>>> 

 附加题：

编写用户登录接口（学的多的同学，尝试做下述作业，这是截止到下周二学完文件处理之后的作业）
#1、输入账号密码完成验证，验证通过后输出"登录成功"
#2、可以登录不同的用户
#3、同一账号输错三次锁定（附加功能，在程序一直运行的情况下，一旦锁定，则锁定5分钟后自动解锁）
#扩展需求：在3的基础上，完成用户一旦锁定，无论程序是否关闭，都锁定5分钟

代码如下：

#!/usr/bin/env python
#-*- coding:utf-8 -*-
#project:login
#author:surpass_w

import os
import sys
import time
import subprocess
from threading import Timer

user_info = [{'account':'egon','password':'success888'},
             {'account':'alex','password':'ok666abc'},
             {'account':'surpass','password':'svipaa1'}]
err_record = [{'account':'egon','record':0},
              {'account':'alex','record':0},
              {'account':'surpass','record':0}]
lock_file = 'block_account.txt'

class Login:
    def __init__(self,user_dict,err_dict,interval):
        self.user_dict = user_dict
        self.err_dict = err_dict
        self.interval = interval

    def login(self):
        count = 0
        self.del_lock_account = []
        while True:
            try:
                f = open(lock_file,'r+')
            except:
                cmd = 'touch %s
chmod +x %s' % (lock_file,lock_file)
                subprocess.check_call(cmd,shell=True)
                f = open(lock_file,'r+')
            lock_user_list = f.readlines()
            self.lock_account_dict = {lock_user_list[i].replace('
','').split(' ')[0]
                                 :lock_user_list[i].replace('
','').split(' ')[1]
                                  for i in range(len(lock_user_list))}
            username = input('Please enter your account >>>:')
            if username in self.lock_account_dict.keys():
                print('The account [%s] has been locked' % username)
            elif username in self.user_dict.keys():
                password = input('Please enter your password >>>:')
                if password == self.user_dict.get(username):
                    print('Welcome %s, a successful login!' % username)
                    sys.exit(0)
                else:
                    self.err_dict[username] += 1
                    if self.err_dict[username] == 3:
                        lock_time = int(time.time())
                        self.del_lock_account.append(username)
                        f.write(username+' '+str(lock_time)+'
')
                        self.err_dict[username] = 0
                        print('The account [%s] is about to be locked' % username)
                        self.t = Timer(self.interval,self.update_lock_file)
                        self.t.start()
                    else:
                        print('Wrong password!
You have 3 chances in all, remain %d.'
                               %(3-self.err_dict[username]))
            else:
                count += 1
                if count == 3:
                    print('Enter invalid account 3 times, the system is shutdown!')
                    sys.exit(0)
                else:
                    print('The account [%s] does not exist!
Please reenter, you have 3 chances'+
                           'in all, remain %d.' % (3-count))
            f.close()

    def update_lock_file(self):
        for i in range(len(self.del_lock_account)):
            if self.del_lock_account[i] in self.lock_account_dict.keys():
                local_machine_time = int(time.time())
                if (int(self.lock_account_dict.get(self.del_lock_account[i]))
                    +300) == local_machine_time:
                    del self.lock_account_dict[self.del_lock_account[i]]
        f1 = open(lock_file,'w')
        for k,v in self.lock_account_dict.items():
            f1.write(k+' '+v+'
')
        f1.close()

def main():
    user_dict = {user_info[i].get('account'):user_info[i].get('password')
                  for i in range(len(user_info))}
    err_dict = {err_record[j].get('account'):err_record[j].get('record')
                 for j in range(len(err_record))}
    interval = 300
    l = Login(user_dict,err_dict,interval)
    l.login()

if __name__ == '__main__':
    main()