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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()