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Adding commas to digits

Copy from Marek Baczynski's code here
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/439357
def group(n, sep = ','):
    s = str(n)[::-1]
    groups = []
    i = 0
    while i < len(s):
        groups.append(s[i:i+3])
        i += 3
    return sep.join(groups)[::-1]

#>>> group(42424242)
#'42,424,242'

to python digit comma by korakot on Aug 18, 2005 2 Comments
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