python 模拟银行转账功能过程详解
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()
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