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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def natural_sort_key(s):
 """ returns a key that can be used in sort functions. Example: The normal sort function will ignore the natural order of the integers in the string: ['A99', 'a1', 'a10', 'a100', 'a12', 'a2', 'a24'] When we use this function as a key to the sort function, the natural order of the integer is considered. ['A99', 'a1', 'a2', 'a10', 'a12', 'a24', 'a100'] """

    return [int(text) if text.isdigit() else text
            for text in re.split(INTEGER_RE, str(s))]