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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 get_month_description(self):
 """Generates a description for only the MONTH portion of the expression Returns: The MONTH description """

        return self.get_segment_description(
            self._expression_parts[4],
            '',
            lambda s: datetime.date(datetime.date.today().year, int(s), 1).strftime("%B"),
            lambda s: _(", every {0} months").format(s),
            lambda s: _(", {0} through {1}"),
            lambda s: _(", only in {0}")
        )