python - 从后面的 3 个字符后添加 ", "

Question

我只是试图在每 3 个字符之间显示一个“，”!

我试过:

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，我怎么能从后如此从右到左呢？

编辑:

例如

player = 9502
ranked = 2040
totalpoints = 12390

输出将是:

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，像这样:

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

但是对于用逗号分组的数字，你真正想要做的是:

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