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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 safe_round(self, x):
 """Returns a converter that takes in a value and turns it into an integer, if necessary. Args: col_name(str):
 Name of the column. subtype(str):
 Numeric subtype of the values. Returns: function """

        val = x[self.col_name]

        if np.isposinf(val):
            val = sys.maxsize

        elif np.isneginf(val):
            val = -sys.maxsize

        if np.isnan(val):
            val = self.default_val

        if self.subtype == 'integer':
            return int(round(val))

        return val