經過python實現信用卡消費機制

功能要求：
1.額度15000
2.能夠體現，手續費是5%
3每個月最後一天是出帳單，寫入一個文件
4.記錄每個月平常消費流水（天天的沒筆消費）

5.寫出來本期還款

python源代碼：

 #!/usr/bin/env python
# encoding=utf-8
# author:sihaogongyuan
# date:2015-4-13
# filename:atm-py
# desc:atm-py
#################################################
import sys
import os
sys.path.append('/tmp/python/')
import tab
import time
#################################################
credit_line=int(15000)
old_money=int(15000)
#print type(credit_line)
#counter_fee=0.05
fee_rate=0.05
#################################################
#date=time.strftime('%Y-%m-%d %H:%M:%S')
#################################################
date1=time.strftime('%Y-%m-%d-%H:%M:%S')
f=file('%s.log'%(date1),'w')
f.close()
f=file('%s.log'%(date1),'a')
f.write('交易日期\t交易摘要\t金額\t手續費\t信用額度\n')
#######取現######################################
def qu_xian():
  global credit_line
  global fee_rate
 #date=os.system("date '+%F:%T'")
 #print date
 date=time.strftime('%Y-%m-%d %H:%M:%S')
 quxian_money=int(raw_input('請輸入取現金額:').strip())
 #print quxian_money,type(quxian_money)
 while quxian_money=='':
    continue
  #print quxian_money,type(quxian_money)
 if 0<quxian_money<=credit_line:
  #定義手續費counter_fee
  counter_fee=quxian_money*fee_rate
  credit_line=credit_line-quxian_money-counter_fee
  print '\033[32m已取%d元,手續費是%d元,信用額度是%d元\033[0m'%(quxian_money,counter_fee,credit_line)
  f.write('%s\t取現\t%s\t%d\t%d\n'%(date,quxian_money,counter_fee,credit_line))
  f.flush()
 else:
  print '\033[31m取現金額%d不在信用額度內,取現失敗\033[0m'%(quxian_money)
#######刷卡########################################
def shua_ka():
 global credit_line
 #date=os.system("date '+%F:%T'")
 date=time.strftime('%Y-%m-%d %H:%M:%S')
 shuaka_money=int(raw_input('請輸入消費金額:').strip())
 if 0<shuaka_money<=credit_line:
  credit_line=credit_line-shuaka_money
  print '\033[32m已消費%d元,信用額度是%d元\033[0m'%(shuaka_money,credit_line)
  #f.write(os.system('date'),'\t','刷卡','\t',shuaka_money,0)
  f.write('%s\t刷卡\t%s\t0\t%d\n'%(date,shuaka_money,credit_line))
  f.flush()
 else:
  print '\033[31m消費金額%d不在信用額度內,消費失敗\033[0m'%(shuaka_money)
########存錢#######################################
def cun_qian():
 global credit_line
 #date=os.system("date '+%F:%T'")
 date=time.strftime('%Y-%m-%d %H:%M:%S')
 cun_qian_money=int(raw_input('請輸入存錢金額:').strip())
 if cun_qian_money>0:
  credit_line=credit_line+cun_qian_money
  print '\033[32m存款%d成功，目前信用額度是:%d'%(cun_qian_money,credit_line)
  f.write('%s\t存錢\t-%s\t0\t%d\n'%(date,cun_qian_money,credit_line))
  f.flush()
 else:
  print '\033[31m存取金額%d不符合規範，存款失敗\033[0m'%(cun_qian_money)
###########main####################################
print '\t歡迎來到ATM系統'
while True:
 #credit_line=int(15000)
 #fee_rate=0.05
 choice=raw_input('請輸入你要進行的操做(取現,消費,存錢,退出):').strip()
 if choice=='':
    continue
 if choice=='取現' or choice=='提現':
  qu_xian()
  continue
 elif choice=='刷卡' or choice=='消費':
  shua_ka()
  continue
 elif choice=='存錢' or choice=='存款':
  cun_qian()
  continue
 elif choice=='退出' or choice=='exit':
  break
 else:
  print '不合規的操做，請從新選擇'
  continue
###################################################
f.write('\033[32m目前可用信用額度爲:%s\n\033[0m'%(credit_line))
f.flush()
f.write('\033[32m本期還款金額爲%d\n\033[0m'%(old_money-credit_line))
f.flush()
f.close()
f=file('%s.log'%(date1),'r')
print f.read()
###################################################