从后面添加3个字符后添加“，”

Question

我只是试图展示一个＆＃34;，＆＃34;每3个字符之间！

我尝试过：

players = ','.join([player[i:i+3] for i in range(0, len(player), 3)])
rankedplayers = ','.join([ranked[i:i+3] for i in range(0, len(ranked), 3)])
points = ','.join([totalpoints[i:i+3] for i in range(0, len(totalpoints), 3)])

但它只是从左到右开始，我怎么能从后到右做到呢？

编辑：

例如

player = 9502
ranked = 2040
totalpoints = 12390

输出结果为：

player 950,2
ranked 204,0
totalpoints = 123,90

应该是：

player = 9,502
ranked = 2,040
totalpoints = 12,390

Answer 1

你可以从另一边反转范围，如下：

player = ','.join([player[i:i+3] for i in reversed(range(0, len(player), 3))]) 

但是为了用逗号分组数字，你真正想做的是：

player = "{:,}".format(int(player)) 

Answer 2

此regex完全符合您的要求：

(/(\d)(?=(?:\d{3})+$)/g, '$1,')

最适合使用replace方法。