python编程练习

http://www.iplaypy.com/python-100/

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1.用户三次登陆机会，三次登录失败，验证码验证，验证成功继续三次登陆机会，验证失败退出。

代码：

def vertified():
    import random
    temp = ""
    for i in range(6):
        num = random.randrange(0,4)
        if num ==2 or num == 4:
            rad_1 = random.randrange(0,10)
            temp  += str(rad_1)
        else:
            rad_2 = random.randrange(65,91)
            temp += chr(rad_2)
    print(temp)
    return temp



def outer(func):
    def inner():
        time = 1
        while True:
            name = input('please input your id:')
            key = input('key:')
            if name == 'vae' and  key == '12345':
                print("登陆成功！")
                break
            elif time == 3:
                ert = vertified()
                ret = input('check the verification code:' )
                if ret == ert:
                    continue
                else:
                    print('登陆失败！')
                    break
            else:
                print('再次尝试！')
                time += 1
                continue
    return inner


@outer
def lock():
    return 0

lock()

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2.实现用户输入用户名和密码，程序在已有用户信息文件中检索，若一致则登陆成功！

def login(username,pwd):
    s = open('s9.txt','r',encoding='utf-8')
    for line in s:
        generlize = line.strip()
        line_list = generlize.split('$')
        if username == line_list[0] and pwd == line_list[1]:
            return True
    return False

username = input('用户名：')
pwd = input('密码：')

is_login = login(username,pwd)
if is_login :
    print('login sucessfully!')
else:
    print('login failly')

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3.用户登陆和注册（用户名占用or成功注册）

def login(username,pwd):
    s = open('s9.txt','r',encoding='utf-8')
    for line in s:
        generlize = line.strip()
        line_list = generlize.split('$')
        if username == line_list[0] and pwd == line_list[1]:
            return True
    return False

def username_exist(username):
    with open ('s9.txt','r',encoding = 'utf-8') as f:
        for line in f:
            generlization = line.strip()
            line_list = generlization.split('$')
            if line_list[0] == username:
                return True
    return False

def register(username,pwd):
    with open('s9.txt','a',encoding = 'utf-8') as f:
        temp = "
"+ username + "$" + pwd
        f.write(temp)
        f.close()

def main():
    print('欢迎登录**系统''
'
          '1:登录；2:注册')
    ret = input('您想要：')
    if ret == "1":
        username = input('用户名：')
        pwd = input('密码：')
        is_login = login(username, pwd)
        if is_login:
            print('login sucessfully!')

        else:
            print('login failly')

    elif ret == "2":
        username = input('用户名：')
        pwd = input('密码：')
        is_username = username_exist(username)
        if is_username:
            print('用户名被占用，注册失败')
        else:
            register(username, pwd)
            print('注册成功！')
main()

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