信用卡交易系统 Python - __MagicPower

信用卡交易系统 Python

#!/usr/bin/env python
#--*-- coding:utf-8 --*--

#safe_float 的函数主体
def safe_float(obj):
    \'safe version of float()\'
    try:
        retval = float(obj)
    except (ValueError,TypeError),diag:
        retval = str(diag)
    return retval

def main():
    \'handles all the data processing\'
    log = open(\'cardlog.txt\',\'w\') #记录log
    try:
        ccfile = open(\'carddata.txt\',\'r\')
    except IOError,e:
        log.write(\'no txns this month\n\')
        log.close()
        return 

    txns = ccfile.readlines()
    ccfile.close()
    total = 0.00
    log.write(\'account log:\n\')

    for eachTxn in txns:
        result = safe_float(eachTxn)
        if isinstance(result,float): #检查是否为float
            total += result
            log.write(\'data... processed\n\')#写入
        else:
            log.write(\'ignore:%s\'%result)
    print \'$%s.2f (new balance)\'%(total)
    log.close()

if __name__ == \'__main__\':
    main()