功能

1.随机验证码

# 只有字母
import random
temp=""
for i in range(4):
    rad= random.randrange(65, 91)
    c = chr(rad)
    temp=temp+c
print(temp)
# 有数字有字母
import random
temp=""
for i in range(6):
    num = random.randrange(0, 100)
    if num>0 and num<=9:
        temp = temp + str(num)
    else:
        rad = random.randrange(65, 91)
        c = chr(rad)
        temp=temp+c
print(temp)

2.登录程序

# 用户登录程序  函数式编程
def login(username,password):
    """
    用于用户名密码的验证
    :param username:用户名
    :param password:密码
    :return:True，用户名验证成功。False，用户验证失败
    """
    f = open("db","r",encoding="utf-8")
    for line in f:
        line=line.strip()
        #   默认strip无参数，去除空格和换行符
        #   有参数，移除两端指定的值
        line_list = line.split("$")
        if username==line_list[0] and password==line_list[1]:
            # print("登陆成功！")
            return True
    return False
# 应用函数
# user = input("请输入用户名：")
# pwd = input("请输入密码：")
# is_login = login(user,pwd)
# if is_login:
#     print("登陆成功")
# else:
#     print("登录失败")

def register(username,password):
    """
    注册
    :param username: 用户名
    :param password: 密码
    :return:True 注册成功
    """
    with open("db", "a", encoding="utf-8") as f:
        temp="
"+username+"$"+password #注意这的写法
        f.write(temp)
        return True
def user_exist(username):
    """
    查看用户名是否存在
    :param username: 用户名
    :return: 如果用户名已经存在返回True，不存在返回False
    一行一行去查找，如果存在返True
    """
    with open("db","r",encoding="utf-8") as f:
        for line in f:
            line=line.strip()
            line_list=line.split("$")
            if line_list[0]==username:
                return True
        return False

def main():
    print("欢迎登录xxx")
    inp=input("1:登录,2:注册")
    inp=int(inp)
    if inp==1:
        user = input("请输入用户名：")
        pwd = input("请输入密码：")
        is_login = login(user, pwd)
        if is_login:
            print("登陆成功")
        else:
            print("登录失败")
    elif inp==2:
        user = input("请输入用户名：")
        pwd = input("请输入密码：")
        is_exist=user_exist(user)
        if is_exist:
            print("用户名已经存在，无法注册")
        else:
            result = register(user,pwd)
            if result:
                print("注册成功")
            else:
                print("注册失败")
main()

 3.匹配ip地址

见视频186

4.加密登录

#!/usr/bin/env python
import hashlib
def md5(arg):
    hash=hashlib.md5(bytes("sdagf2356",encoding="utf-8"))
    hash.update(bytes(arg,encoding="utf-8"))
    return hash.hexdigest()


def login(username,password):
    f = open("db","r",encoding="utf-8")
    for line in f:
        line=line.strip()
        #   默认strip无参数，去除空格和换行符
        #   有参数，移除两端指定的值
        line_list = line.split("$")
        y=md5(password)
        if username==line_list[0] and str(y)==line_list[1]:
            # print("登陆成功！")
            return True
    return False
def register(username,password):
    with open("db","a",encoding="utf-8") as p:
        x=md5(password)
        temp = "
"+username+"$"+str(x)
        s=p.write(temp)
    return True
def isexist(username):
    with open("db","r",encoding="utf-8") as s:
        for line in s:
            line.strip()
            line_list = line.split("$")
            if line_list[0] == username:
                return True
        return False
def main():
    print("欢迎登录xxx")
    inp=input("1:登录,2:注册")
    inp=int(inp)
    if inp==1:
        user = input("请输入用户名：")
        pwd = input("请输入密码：")
        is_login = login(user, pwd)
        if is_login:
            print("登陆成功")
        else:
            print("登录失败")
    elif inp==2:
        user = input("请输入用户名：")
        pwd = input("请输入密码：")
        is_exist=isexist(user)
        if is_exist:
            print("用户名已经存在，无法注册")
        else:
            result = register(user,pwd)
            if result:
                print("注册成功")
            else:
                print("注册失败")
main()