> I assume you mean translating something like '1000000' to '1,000,000'?
> I don't know of an existing function that does this, but here's a
> relatively simple implementation:
>
> py> import itertools as it
> py> def add_commas(s):
> ... rev_chars = it.chain(s[::-1], it.repeat('', 2))
> ... return ','.join(''.join(three_digits)
> ... for three_digits
> ... in it.izip(*[rev_chars]*3))[::-1]
> ...
Or for an equivalent less cryptic (IMHO) recipe:
def num2str(num):
'''Return a string representation of a number with the thousands
being delimited.
>>> num2str(65837)
'65,837'
>>> num2str(6582942)
'6,582,942'
>>> num2str(23)
'23'
>>> num2str(-1934)
'-1,934'
'''
parts = []
div = abs(num)
while True:
div,mod = divmod(div,1000)
parts.append(mod)
if not div:
if num < 0: parts[-1] *= -1
return ','.join(str(part) for part in reversed(parts))
Regards,
George
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