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python 模拟银行转账功能过程详解

更新时间:2020-07-21 14:48:01 作者:startmvc
首先画出流程图,流程图与现实代码有出入,因为刚开始画流程图的时候,有些东西没考虑

首先画出流程图,流程图与现实代码有出入,因为刚开始画流程图的时候,有些东西没考虑进去,后来写着写着就慢慢能想起来并实现了。

另有一点经验推荐给新手朋友,如果说碰到一个项目无从下手的话,就先慢慢去写,写着写着你就会往下写了,真的,亲身实践。望大神勿喷~


#!/usr/bin/env python
#encoding:utf-8
import re
import pickle
import time
def getUser():
 '''从数据文件里获取银行卡用户信息'''
 with open('cardinfo.db','r') as f:
 return pickle.load(f)
def panDing():
 '''判定用户银行卡信息跟密码信息的准确性'''
 while True:
 user_dict=getUser()
 print user_dict
 card_num=raw_input('请输入您的19位银行卡号(只包含数字):')#获取用户卡号
 if re.match('\d{19}',card_num) and card_num in user_dict:#判断卡号是否匹配
 card_passwd=(raw_input('请输入您的银行卡密码:'))
 # print '输入的密码是:%s,类型为:%s' % (int(card_passwd),type(int(card_passwd)))
 # print '存的密码是:%s,类型为:%s' % (user_dict[card_num]['password'],type(user_dict[card_num]['password']))
 if int(card_passwd) == user_dict[card_num]['password']:#判定密码对错
 break
 else:
 print '密码错误!'
 continue
 else:
 print '您输入的银行卡信息有误!'
 return card_num

def zhuanZhang(srcaccount):
 '''用户转账操作'''

 user_dict = getUser()
 while True:
 target_account = raw_input('请输入目标账户:')
 if re.match('\d{19}', target_account) :
 if target_account in user_dict: # 判断卡号是否匹配

 while True:
 tr_balance = int(raw_input('请输入转账金额:'))
 if tr_balance <= user_dict[srcaccount]['balance']:#对比转账金额跟账户余额
 break
 else:
 print '转账金额大于余额,请重新输入余额!'
 break
 else:
 print '卡号错误,请重新输入!'
 else:
 print '卡号不对'
 print '转入的账户为:%s ,金额为:%s' % (target_account,tr_balance)
 print '原账户为:%s ,余额为:%s' % (srcaccount,user_dict[srcaccount]['balance'])
 print user_dict
 user_dict[srcaccount]['balance']=user_dict[srcaccount]['balance']-tr_balance
 user_dict[target_account]['balance'] = user_dict[target_account]['balance'] + tr_balance
 print '转入的账户为:%s ,转入的金额为:%s' % (target_account, tr_balance)
 # print '转入账户为:%s ,余额为:%s' % (target_account, user_dict[target_account]['balance'])
 print '原账户为:%s ,余额为:%s' % (srcaccount, user_dict[srcaccount]['balance'])
 print user_dict
 with open('cardinfo.db','w') as f:
 pickle.dump(user_dict,f)
 with open('op.log','a+') as f:
 f.writelines('%s 账户%s转入到账户%s中%s人民币' % (time.strftime('%Y-%m-%d %H:%M:%S'),srcaccount,target_account,tr_balance),f)
 print '%s 账户%s转入到账户%s中%s人民币' % (time.strftime('%Y-%m-%d %H:%M:%S'),srcaccount,target_account,tr_balance)




def quXian(user_card):
 '''用户取现操作'''
 user_dict = getUser()
 while True:
 qx_balance=raw_input('请输入取现金额:')
 if re.match('\d+',qx_balance):
 print user_dict[user_card]['balance']
 if int(qx_balance) <= user_dict[user_card]['balance']:
 user_dict[user_card]['balance'] = user_dict[user_card]['balance'] - int(qx_balance)
 print user_dict
 with open('cardinfo.db', 'w') as f:
 pickle.dump(user_dict, f)
 with open('op.log', 'a') as f:
 f.write('%s 账户 %s 取现人民币 %s' % (time.strftime('%Y-%m-%d %H:%M:%S'), user_card,qx_balance))
 print '%s 账户[%s]取现人民币%s圆' % (time.strftime('%Y-%m-%d %H:%M:%S'), user_card,qx_balance)
 break
 else:
 print '余额不够!'
 else:
 print '输入的格式有误'
 # with open('cardinfo.db','r') as f:
 # print pickle.load(f)
 # with open('op.log','r') as f:
 # print pickle.load(f)

def chaBalance(user_dict,user_card):

 print '账户余额为:%s ' % user_dict[user_card]['balance']

def run():
 user_card = panDing()
 print user_card
 while True:
 user_dict=getUser()
 # print '账户余额为:%s ' % user_dict[user_card]['balance']
 choose_num=raw_input('请确认操作:(转账请按1,取现请按 2,余额查询请按3,退出请按4):')
 if re.match('[1234]',choose_num):#根据用户选择类型判断执行方法
 if re.match('[1234]',choose_num).group() == '1':#转帐
 zhuanZhang(user_card)
 elif re.match('[1234]',choose_num).group() == '2':#取现
 quXian(user_card)
 elif re.match('[1234]',choose_num).group() == '3':#余额查询
 chaBalance(user_dict, user_card)
 else:#退出
 break
if __name__ == '__main__':
 run()

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

python 模拟 银行转账功能