Python Simple analog Bank transfer function

See the work of the third lesson of the Python tutorial

First draw a flowchart, the flow chart and the actual code discrepancies, because the beginning of the drawing process, some things are not considered in, and then write to write slowly can think of and realized.

Another point of experience to recommend to novice friends, if said to encounter a project can not start, then slowly to write, write write you will write down, really, hands-on practice. Hope Big God don't squirt ~

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#!/usr/bin/env python#encoding:utf-8import reimport pickleimport timedef getuser ():      "Get bank card user information from data file" '     with open (' cardinfo.db ', ' R ')  as  f:        return pickle.load (f) def panDing ():      ' Determine the accuracy of the user's bank card information and password information '     while True:         user_dict=getuser ()         print user_ Dict        card_num=raw_input (' Please enter your 19-digit bank card number (including numbers only): ') #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 (' Please enter your bank card password: ')             # print   ' password entered is:%s, type:%s '  %  (int (CARD_PASSWD), type (int (card_passwd)))              # print  ' saved password is:%s, type:%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  ' password is wrong! '                 continue         else:             print  ' The card information you entered is incorrect! '     return card_numdef zhuanzhang (Srcaccount):     ' user transfer operation '     user_dict = getuser ()      while True:        target_account =  Raw_input (' Please enter target account: ')         if re.match (' \d{19} ',  target_ account)  :            if target_account  in user_dict:  #  determine if the card number matches                  while True:                     tr_balance = int (Raw_input (' Please enter the transfer amount: ')                      if tr_balance <= user_dict[srcaccount][' balance ': #对比转账金额跟账户余额                           break                     else:                         print  ' transfer amount is greater than the balance, please re-enter the balance! '                 break             else:                 print  ' card number error, please re-enter! '         else:             print  ' card number not '     print  ' transferred to account:%s , Amount:%s '  %  ( target_account,tr_balance)     print  ' original account:%S&NBSP;, the balance is:%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  ' transferred account:%s , the amount transferred is:%s '  %  (Target_account,  tr_balance)     # print  ' transfer to account:%s , Balance:%s '  %  (target_account ,  user_dict[target_account][' balance ')     print  ' original account:%s , Balance:%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:      &Nbsp;  f.writelines ('%s  account%s ' transferred to account%s '%s RMB '  %  (time.strftime ('%y-%m-%d %h:%m:%s ') , srcaccount,target_account,tr_balance), f)         print  '%s  Account%s is transferred to%s RMB  %  (time.strftime ('%y-%m-%d %h:%m:%s ') in account%s, srcaccount,target_account,tr_balance) Def quxian (User_card):     "User withdrawal action"     user_dict =  GetUser ()     while true:        qx_balance= Raw_input (' Please enter cash amount: ')         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  account  %s  cash withdrawal RMB  %s '  %  (time.strftime ('%y-%m-%d %h:%m:%s '),  user_card,qx_balance)                      print  '%s  account [%s] withdrawals RMB%s round '  %  (time.strftime ('%y-%m-%d  %h:%m:%s '),  user_card,qx_balance)                  break             Else:                print   ' balance is not enough! '         else:             print  ' input format is incorrect '     # 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  ' Account balance is:%s  ' &Nbsp;% user_dict[user_card][' balance ']def run ():     user_card = panding ()     print user_card    while True:         user_dict=getuser ()         # print  ' Account balance is:%s  '  % user_dict[user_card][' balance ']         Choose_num=raw_input (' Please confirm the operation: (Transfer please press 1, cash withdrawal please press &NBSP;2, balance enquiry Please press 3, exit please press 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 &NBSp;               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 ()

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Python Simple analog Bank transfer function