Custom Comma Separators?

Question

I am working on an application that presents data to both Indian and US managers.

I'd like to display numbers with western-style comma separation (000,000,000) or Indian style (00,00,00,000) based on the currency being displayed. I don't want to use localize as figures need to be displayed consistently, no matter which region it is being viewed in.

For my purposes, the final three zeroes in each case can be dropped, so that I will either need a comma every third or second character, working from the end.

I'm starting with something like this:

def commas(str, format="US"):
     if format == "IN":
         x = 2 
     elif format == "US":
         x = 3

     new_str = ','.join(str[i:i+x] for i in range(0, len(str), x))

     return new_str

This outputs a number like so: 815,532,89. Is there a way to reverse this so that I can get it to render properly?

Please try if '{:03}'.format(x) sutits your needs (where x is a number). — MaLiN2223, Jan 27 '17 at 14:09
The information in [this answer](http://stackoverflow.com/a/3909907/355230) might be helpful. — martineau, Jan 27 '17 at 14:18
Ah ok, it looks like I have to set up some localization to utilize this? I'm trying to avoid doing so as I want to use both formats and have them consistent across regions — Adam Starrh, Jan 27 '17 at 14:21

score 1 · Accepted Answer · answered Jan 27 '17 at 14:10

You can apply the commas to the reversed string and then reverse it again:

def commas(str, format="US"):
     if format == "IN":
         x = 2 
     elif format == "US":
         x = 3

     rev = str[::-1]
     new_str = ','.join(rev[i:i+x] for i in range(0, len(rev), x))[::-1]

     return new_str

Custom Comma Separators?

1 Answers1