用户登录和用户新增

#coding:utf-8
with open('bank_card', 'w', encoding='utf-8') as write_f:
    write_f.write("qianmeng  123456  15000\n")
    write_f.write("zhangsan  123  15000\n")
    write_f.write("lisi  abc 15000\n")
def login(name,password):
    with open('bank_card','r',encoding='utf-8') as read_f:
        for i in read_f:
            if i.split()[0]==name and i.split()[1]==password:
                print('登录成功')
                return 1
        else:
            print("用户名或密码错误")
            return 0
def create_user():
    #print('请输入用户名：')
    name=input("请输入用户名：")
    password=input("请输入密码：")
    with open('bank_card','a',encoding='utf-8') as write_f:
        a=name+' '+password+' 15000'
        write_f.write(a)
        return 1

购物程序
#coding:utf-8
goods=[['1','电脑',5000],['2','鼠标',20],['3','手机',3000]]
def buy_goods(id,num):
    a=[]
    for b in goods:
        if b[0]==id:
            sale=int(b[2])*num
            c=[b[1],num,sale]
            a.append(c)
            return sale
    else:
        print("没有此商品")
        return 0

银行卡参数说明：

#coding:utf-8
import os
import time
# with open('bank_card', 'w', encoding='utf-8') as write_f:
#     write_f.write("qianmeng 123456 15000 1\n")
#     write_f.write("zhangsan 123 15000 1\n")
#     write_f.write("lisi abc 15000 1\n")
def bank_consumer(name,expence,log_name):
    time1=time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time()))
    expence1=str(expence)
    with open('bank_card','r',encoding='utf-8') as read_f,open('.bank_card.swap','w',encoding='utf-8')as write_f:
        read_f.seek(0,0)
        for i in read_f:
            j=i.split()[0]
            if name==j:
                k=float(i.split()[2])
                h=k-expence
                a=str(h)
                i=i.replace(i.split()[2],a)
                with open(log_name, "a", encoding='utf-8') as log_f:
                    log_f.write(time1)
                    log_f.write("    支出    ")
                    log_f.write(expence1)
                    log_f.write("   元   余额为   ")
                    log_f.write(a)
                    log_f.write("   元\n")
            write_f.write(i)
    os.remove('bank_card')
    os.rename('.bank_card.swap', 'bank_card')
    return a
#bank_consumer('qianmeng',1000,'qianmeng.log')
def yue(name):
    with open('bank_card','r',encoding='utf-8') as read_f:
        for a in read_f:
            if a.split()[0]==name:
                return a.split()[2]
        else:
            return 0
def tixian(name,num):
    d=yue(name)
    a=float(d)
    shouxu=num*0.05
    e=a-num-shouxu
    c=str(e)
    if e < -20000:
        return 0
    with open('.bank_card.swap','w',encoding='utf-8')as write_f,open('bank_card','r',encoding='utf-8')as read_f:
        for b in read_f:
            if b.split()[0]==name:
                # e=a-num-shouxu
                # c=str(e)
                # if e<-20000:
                #     return 0
                m=b.split()[2]
                b=b.replace(m,c)
            write_f.write(b)
    os.remove('bank_card')
    os.rename('.bank_card.swap', 'bank_card')
    return 1
# a=yue("zhangsan")
# print(a)
# b=tixian('zhangsan',40000)
# print(b)
def zhuanzhang(name,toname,num):
    a=yue(name)
    b=float(a)
    e = b - num
    f = str(e)
    if e < 0:
        return 0
    i=yue(toname)
    j=float(i)
    with open('.bank_card.swap', 'w', encoding='utf-8')as write_f, open('bank_card', 'r', encoding='utf-8')as read_f:
        for c in read_f:
            if c.split()[0]==name:
                # e=b-num
                # f=str(e)
                # if e<0 :
                #     return 0
                m=c.split()[2]
                c=c.replace(m,f)
            write_f.write(c)
    os.remove('bank_card')
    os.rename('.bank_card.swap', 'bank_card')
    with open('.bank_card.swap', 'w', encoding='utf-8')as write_f, open('bank_card', 'r',encoding='utf-8')as read_f:
        for d in read_f:
            if d.split()[0]==toname:
                g=j+num
                h=str(g)
                n=d.split()[2]
                d=d.replace(n,h)
            write_f.write(d)
        else:
            print('没有此用户')
            return 0
    os.remove('bank_card')
    os.rename('.bank_card.swap', 'bank_ca