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["Raphael Collet \(OpenERP\)" <rco@xxxxxxxxxxx>]

You can replace take_left_padding and take_right_padding by using a regular expression:

import re
intersperse_pat = re.compile('([^0-9]*)([0-9]*)(.*)')

def intersperse(string, counts, separator=''):
    """

    See the asserts below for examples.

    """
    # extract the first group of digits
    left, rest, right = intersperse_pat.match(string).groups()
    def reverse(s): return s[::-1]
    splits = split(reverse(rest), counts)
    res = separator.join(map(reverse, reverse(splits)))
    return left + res + right, len(splits) > 0 and len(splits) -1 or 0

Note that you can also avoid the multiple reversal of the strings, and perform the splits right-to-left, using negative indexes.  This would be more direct, but less reusable...

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