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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 parseInt(self, words):
 """Parses words to the integer they describe. Args: words (str):
 Description of the integer. Returns: An integer representation of the words. """

        # Remove 'and', case-sensitivity
        words = words.replace(" and ", " ").lower()
        # 'a' -> 'one'
        words = re.sub(r'(\b)a(\b)', '\g<1>one\g<2>', words)

        def textToNumber(s):
            """
            Converts raw number string to an integer.
            Based on text2num.py by Greg Hewill.
            """
            a = re.split(r"[\s-]+", s)
            n = 0
            g = 0
            for w in a:
                x = NumberService.__small__.get(w, None)
                if x is not None:
                    g += x
                elif w == "hundred":
                    g *= 100
                else:
                    x = NumberService.__magnitude__.get(w, None)
                    if x is not None:
                        n += g * x
                        g = 0
                    else:
                        raise NumberService.NumberException(
                            "Unknown number: " + w)
            return n + g

        return textToNumber(words)