python 实现银行管理系统，供大家参考，具体内容如下

有的地方用的方法的比较复杂，主要是为回顾更多的知识

test1用来存类和函数

#test1.py 
import random  #用来随机产生卡号
import pickle #序列化，用来存放和取出产生的用户数据
import os  #产生文件
import re  #正则表达式，用来判断身份证和手机号，其他地方也可以使用
class Card:
 def __init__(self,cardId,password,money=0):
 self.cardId=cardId
 self.password=password
 self.money=money
class User(Card):
 def __init__(self,username,phone,uid,card):
 self.username=username
 self.phone=phone
 self.uid=uid
 self.user_card=card #User继承Card对象
class Bank(User):  #Bank 继承User，Bank是序列化的对象，所以将其变为字典
 def __init__(self,user):
 self.cardId=user.user_card.cardId 
 self.user=user   
 self.users={self.cardId:self.user} #键，卡号 ：值，User对象 

def generate_cardid(): #方法一 产生卡号
 list=[]
 for i in range(0,11):
 n=random.randint(0,9)
 n=str(n)
 list.append(n)
 # str="".join(list)
 return list
# generate_cardid()
# user_cardId=input("请输入您的账号：")
def create_user():  #方法2:开户
 while True:
 uid=input("请输入身份证:")
 realut=re.fullmatch("\d{17}[\d,X]",uid) #正则判断身份证是否合理
 if realut:
  uid=realut.group()
  break
 else:
  print("格式不合法")
  continue
 username=input("请输入姓名:")
 while True:
 phone=input("请输入手机号码:")
 realut = re.fullmatch("1\d{10}", phone) #正则判断手机号是否合理，其他需要判断的地方都可以判断，我就不再使用了
 if realut:
  phone=realut.group()
  # print(phone)
  break
 else:
  print("格式不合法")
  continue
 list=generate_cardid() #得到卡号列表
 cardId="".join(list) #将卡号变成字符串，字符串的卡号才能做成键
 print(f"您的卡号为：{cardId}")
 while True:
 password1=input("请输入密码:")
 password2=input("再次输入密码确认:")
 if password1==password2:
  password=password1
  break
 else :
  print("两次密码不同，请重新输入！")
  continue
 card=Card(cardId,password) 
 user=User(uid,username,phone,card)
 bank=Bank(user) #产生bank对象
 with open(f"data\\{cardId}.txt","ab") as file_w: #重点：创建一个文件夹data来存放产生的bank对象，每个对象根据卡号产生一个txt文件，用来存放用户的所有数据
 pickle.dump(bank,file_w) #将bank 序列化保存到文档中
# create_user()

def user_login(user_cardId): #登录

 if os.path.exists(f"data\\{user_cardId}.txt"):
 with open(f"data\\{user_cardId}.txt", "rb") as file_r:
  u_data = pickle.load(file_r) #根据卡号取出txt文档，反序列化取出数据
  if u_data.cardId == user_cardId: #u_data是一个字典，键是卡号，值是user对象 
  n = 1
  while True:
   if n <= 3:
   user_pw = input("请输入密码:")
   if u_data.user.user_card.password == user_pw:
    return True
   else:
    print("密码错误！")
    n+=1
    continue
   else:
   print("三次输入密码错误！")
   return
 else:
 print("没有该用户")

# user_login(user_cardId)
def save_money(user_cardId): # 方法4:存钱
 if user_login(user_cardId): #如果登录成功
 money=int(input("请您输入存钱金额："))
 with open(f"data\\{user_cardId}.txt", "rb") as file_r:
  u_data = pickle.load(file_r)
  u_data.user.user_card.money=u_data.user.user_card.money+money
  print("您的余额为:",u_data.user.user_card.money)
  with open(f"data\\{user_cardId}.txt", "wb") as file_w: #这里要用wb,而不是ab,改变数据后，需要覆盖原来的数据，而不是添加
  pickle.dump(u_data, file_w)
# save_money()

def withdraw_money(user_cardId): # 方法5:取钱
 if user_login(user_cardId):
 money=int(input("请您输入取款金额："))
 with open(f"data\\{user_cardId}.txt", "rb") as file_r:
  u_data = pickle.load(file_r)
  if money>u_data.user.user_card.money:
  print("余额不足")
  else:
  u_data.user.user_card.money=u_data.user.user_card.money-money
  print("您的余额为:", u_data.user.user_card.money)
  with open(f"data\\{user_cardId}.txt", "wb") as file_w:
   pickle.dump(u_data, file_w)

# withdraw_money()

def transfer_accounts(user_cardId): #方法6，转账
 if user_login(user_cardId):
 with open(f"data\\{user_cardId}.txt", "rb") as file_r:
  u_data = pickle.load(file_r)
  while True:
  money = int(input("请您转账取款金额："))
  if money > u_data.user.user_card.money:
   print("余额不足")
   break
  else:
   cardId=int(input("请您对方卡号："))
   if os.path.exists(f"data\\{cardId}.txt"): #如果对方卡号存在
   u_data.user.user_card.money = u_data.user.user_card.money - money #自己的money减
   print("您的余额为:", u_data.user.user_card.money)
   with open(f"data\\{user_cardId}.txt", "wb") as file_w:
    pickle.dump(u_data, file_w)

   with open(f"data\\{cardId}.txt", "rb") as file_r1: #根据对方的卡号进行查找对方的数据
    u_data1 = pickle.load(file_r1)
    with open(f"data\\{cardId}.txt", "wb") as file_w1:
    u_data1.user.user_card.money = u_data1.user.user_card.money + money #对方money加
    pickle.dump(u_data1, file_w1)
    print("转账成功")
    break
   else:
   print("该用户不存在")
   break

# transfer_accounts()

def select_user(user_cardId): # 方法7:查询余额
 if user_login(user_cardId):
 with open(f"data\\{user_cardId}.txt", "rb") as file_r:
  u_data = pickle.load(file_r)
  print("您的余额为：",u_data.user.user_card.money)
# select_user()

def update_password(user_cardId): # 方法8:修改密码
 if user_login(user_cardId):
 while True:
  pw1=input("请输入新密码:")
  pw2=input("请再次输入密码:")
  if pw1==pw2:
  with open(f"data\\{user_cardId}.txt", "rb") as file_r:
   u_data = pickle.load(file_r)
   u_data.user.user_card.password=pw1
  with open(f"data\\{user_cardId}.txt", "wb") as file_w:
   pickle.dump(u_data, file_w)
   break

  else:
  print("两次密码不相同")
  continue