Split Every N Character

Bank Card

def bank_card(self, message, n=4, fill=' ', strip=False):
    """
    Format bank card, split every n character, n default 4.
    :param message:
    :param n:
    :param fill:
    :param strip:
    :return:
    """
    return fill.join(re.findall(r'.{1,%s}' % (n, ), re.sub(r'\s+', '', message) if strip else message))
  • Usage

    In [2]: bank_card('6225xxxxxxxxxxxx')
    Out[2]: '6225 xxxx xxxx xxxx'
    
    In [3]: bank_card('6225xxxxxxxxxxxxxxx')
    Out[3]: '6225 xxxx xxxx xxxx xxx'
    

References

[1] Brandon L [email protected], Split python string every nth character?

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