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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 Decode(self, attribute, value):
 """Decode the value to the required type."""

    required_type = self._attribute_types.get(attribute, "bytes")
    if required_type == "integer":
      return rdf_structs.SignedVarintReader(value, 0)[0]
    elif required_type == "unsigned_integer":
      return rdf_structs.VarintReader(value, 0)[0]
    elif required_type == "string":
      if isinstance(value, bytes):
        return value.decode("utf-8")
      else:
        return utils.SmartUnicode(value)
    else:
      return value