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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 convert(cls, value, from_base, to_base):
 """ Convert value from a base to a base. :param value: the value to convert :type value: sequence of int :param int from_base: base of value :param int to_base: base of result :returns: the conversion result :rtype: list of int :raises ConvertError: if from_base is less than 2 :raises ConvertError: if to_base is less than 2 :raises ConvertError: if elements in value outside bounds Preconditions: * all integers in value must be no less than 0 * from_base, to_base must be at least 2 Complexity: O(len(value)) """

        return cls.convert_from_int(
           cls.convert_to_int(value, from_base),
           to_base
        )