python exercise1

1.

#!/usr/bin/env Python
# coding:utf-8
_author_ = "tom"

'''
@author:houruiyun
@file:2.py
@contact:674211605.qq.com
@time:6/25/172:45 AM
@desc:
'''
for i in range(1,4):
    name = raw_input('please input your name:')
    password = raw_input('your password:')
    if  (name == 'root' and password == 'westos'):
        print 'welcome to user manager system'
        exit (0)
    else:
        print 'the user and password is not matching'
print ('你已经登陆过三次，请十分钟后登陆')

2.打印所有小于10并且大于或等于0的所有偶数； 
打印所有小于10并且大于或等于0的最大偶数 

源代码：

# /usr/bin/env python# coding:utf-8_author_ = "lvah"'''@author:fairy@file:homework1.py@time:17-7-5下午11:32@DESC;'''print range(0,10,2)print range(1,10,2)
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3.判断一个数是否为质数 
源代码：

#/usr/bin/env python#coding:utf-8_author_ = "lvah"'''@author:fairy@file:3.py@time:17-7-6上午1:43@DESC;'''num = input('请输入数字：')if num > 1:    for n in range(2,num):        if ( num % n ) == 0:            print num,'不是质数'            break    else:        print num,'是质数'else:    print num,'不是质数'
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测试： 

8.创建一用户登陆程序：保存用户的用户名与密码 
新建用户时，判断用户名是否已经存在，若已经存在则报错； 
登陆系统时，确保用户名存在于系统中，密码正确，有三次机会，超过三次则报错 
源代码：

# /usr/bin/env python# coding:utf-8_author_ = "lvah"'''@author:fairy@file:8.py@DESC;'''Username = []Password = []print '''    登陆(L)ogin   新建(N)ew'''def login():    if Username == []:        print  '无用户，请新建用户'    else:        count = 0        while count<3:            name_in = raw_input('name:')            pass_in = raw_input('password:')            if name_in in Username:                i = Username.index(name_in)                pass1 = Password[i]                if pass_in == pass1:                    print 'welcome to user system'                    exit(0)                else:                    count += 1            else:                count += 1        print 'error'def new():    name2 = raw_input('new name:')    if name2 not in Username:        Username.append(name2)        pass2 = raw_input('new password:')        Password.append(pass2)        print 'Adding new user successful'    else:        print 'error : the user has exists'def main():    cho = 'Enter your choice:'    while True:        pro = raw_input(cho).lower()        if pro == 'l':            login()        elif pro == 'n':            new()        else:            print 'you can input l,n'main()
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测试：