python 模拟银行转账功能过程详解

#!/usr/bin/env python#encoding:utf-8import reimport pickleimport timedef 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_numdef 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        breakif __name__ == '__main__':  run()