• python--第四天练习题


    #1、写函数,利用递归获取斐波那契数列中的第 10 个数,并将该值返回给调用者。
    def rec(a,b,dep=1):
        c = a + b
        if dep == 10:
            return c
        return rec(b,c,dep+1)
    
    print(rec(5,5))
    
    
    #2、编写用户登录程序,(读写文本版,可注册用户,修改用户密码)
    import os
    #注册账号
    def zhuce(user,pawd,file):
        with open(file, 'r+', encoding='utf-8') as f1:
            for line in f1:
                if user == line.split(':')[0]:
                    return False
            else:
                f1.write(user + ':' + pawd + '
    ')
                return True
    #登录账号
    def denglu(user,pawd,file):
        with open(file, 'r', encoding='utf-8') as f1:
            for line in f1:
                if '{}:{}'.format(user,pawd) == ''.join(line).strip():
                    return True
            return False
    
    #修改密码
    def xiugai(user,pawd,file,new_pawd):
        line2 = ''
        ret = False
        with open(file,'r') as f1,open('fana.bak','w') as f2:
            for line in f1:
                if '{}:{}'.format(user,pawd) == line.strip():
                    ret = True
                    line2 += line.replace(user + ':' + pawd, user + ':' + new_pawd)
                else:
                    line2 +=line
                    if ret != True:
                        ret = False
            f2.write(line2)
        os.remove('fana.txt')
        os.rename('fana.bak','fana.txt')
        return ret
    
    #注销用户
    def zhuxiao(user,pawd,file):
        line2 = ''
        ret = False
        with open(file,'r') as f1,open('fana.bak','w') as f2:
            for line in f1:
                if '{}:{}'.format(user,pawd) == line.strip():
                    ret = True
                else:
                    line2 += line
                    if ret != True:
                        ret = False
            f2.write(line2)
        os.remove('fana.txt')
        os.rename('fana.bak','fana.txt')
        return ret
    
    def taobao(arg):
        file = 'fana.txt'
        user = input("请输入用户名:")
        pawd = input("请输入密码:")
        if arg == 'z':
            zhu = zhuce(user,pawd,file)
            if zhu == False:
                print("用户名已存在")
            else:
                print('注册成功')
        elif arg == 'a':
            deng = denglu(user,pawd,file)
            if deng:
                return '欢迎登陆淘宝!'
            else:
                print('账号或密码错误')
        elif arg == 'x':
            new_pawd = input("请输入您的新密码")
            xiu = xiugai(user,pawd,file,new_pawd)
            if xiu:
                print("密码修改成功")
            else:
                print("账号或密码错误")
        elif arg == 'e':
            xiao = zhuxiao(user,pawd,file)
            if xiao:
                print("账号注销成功")
            else:
                print("账号或密码错误")
    
    while True:
        jd = input("注册请按:z,登陆请按:a,退出按:q >>")
        if jd.lower() == 'z':
            taobao('z')
        elif jd.lower() == 'a':
            ta = taobao('a')
            if ta == '欢迎登陆淘宝!':
                print('欢迎登陆淘宝!')
                se = input('修改密码:x,注销:e >>')
                if se == 'x':
                    print('修改密码前!',end='')
                    taobao('x')
                elif se == 'e':
                    print('注销账号前!', end='')
                    taobao('e')
                else:
                    print('请按照提示输入!')
        elif jd.lower() == 'q':
            print('退出成功')
            break
        else:
            print("请按照提示输入!")
    
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  • 原文地址:https://www.cnblogs.com/fan-gx/p/11489294.html
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