How to print an integer with commas; E.g., 3,056,789

John Arundel john at splange.freeserve.co.uk
Wed Oct 16 14:53:38 CEST 2002


On 2002-10-16 at 08:06:33, Padraig Brady warbled:
> >Given any integer n, how can I convert str(n) to a string with commas in 
> >the appropriate places? For example, if n is 3056789, I'd like to convert 
> >str(3056789) to "3,056,789", for better readability of output.
> 
> Yes wouldn't it be nice to have:
> 
> >>> i=3056789
> >>> print "%h %.2m %.2M %.2k %.2K" % i, i, i, i, i
> 3,056,789 3.06M 2.92Mi 3056.79K 2985.15Ki

How about:

def commaise(seq):
    if len(seq) <= 3:
        return seq
    else:
        return "".join(commaise(seq[:-3]) + ',' + seq[-3:])

>>> commaise("3056789")
'3,056,789'

-- 
"I was an only child... eventually."
                                                      - Steven Wright
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