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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 min(self, numeric_only=None, **kwargs):
 """ The minimum value of the object. Only ordered `Categoricals` have a minimum! Raises ------ TypeError If the `Categorical` is not `ordered`. Returns ------- min : the minimum of this `Categorical` """

        self.check_for_ordered('min')
        if numeric_only:
            good = self._codes != -1
            pointer = self._codes[good].min(**kwargs)
        else:
            pointer = self._codes.min(**kwargs)
        if pointer == -1:
            return np.nan
        else:
            return self.categories[pointer]