Python

# import a groupby() method # from itertools module from itertools import groupby # dictionary INFO = [ {'employee': 'XYZ_1', 'company': 'ABC_1'}, {'employee': 'XYZ_2', 'company': 'ABC_2'}, {'employee': 'XYZ_3', 'company': 'ABC_3'}, {'employee': 'XYZ_4', 'company': 'ABC_3'}, {'employee': 'XYZ_5', 'company': 'ABC_2'}, {'employee': 'XYZ_6', 'company': 'ABC_3'}, {'employee': 'XYZ_7', 'company': 'ABC_1'}, {'employee': 'XYZ_8', 'company': 'ABC_2'}, {'employee': 'XYZ_9', 'company': 'ABC_1'} ] # define a fuction for key def key_func(k): return k['company'] # sort INFO data by 'company' key. [Read More]

最近在项目中遇到前后端计算数值不一样的情况，发现是由于 Python3 数学运算处理方式和 PHP BC Math 不一样 PHP 的 round 函数 round ( float $val , int $precision = 0 , int $mode = PHP_ROUND_HALF_UP ) : float Constants Description PHP_ROUND_HALF_UP Rounds num away from zero when it is half way there, making 1.5 into 2 and -1.5 into -2. PHP_ROUND_HALF_DOWN Rounds num towards zero when it is half way there,making 1. [Read More]

other languages http://0.30000000000000004.com

how did this happen  http://www.laruence.com/2013/03/26/2884.html

Mathematical extensions in php and decimal module in python to avoid this