code: def get_limit_source(self):
          
          if self.limit_override is not None and (
                  self.override_ta is True or
                  (self.ta_limit is None and self.ta_unlimited is False)
          ):
              return SOURCE_OVERRIDE
          if self.api_limit is not None:
              return SOURCE_API
          if self.ta_limit is not None or self.ta_unlimited is True:
              return SOURCE_TA
          return SOURCE_DEFAULT
docs: Return :py:const:`~awslimitchecker.limit.SOURCE_DEFAULT` if
          :py:meth:`~.get_limit` returns the default limit,
          :py:const:`~awslimitchecker.limit.SOURCE_OVERRIDE` if it returns a
          manually-overridden limit,
          :py:const:`~awslimitchecker.limit.SOURCE_TA` if it returns a limit from
          Trusted Advisor, or   :py:const:`~awslimitchecker.limit.SOURCE_API`
          if it returns a limit retrieved from the service's API.
  
          :returns: one of :py:const:`~awslimitchecker.limit.SOURCE_DEFAULT`,
            :py:const:`~awslimitchecker.limit.SOURCE_OVERRIDE`, or
            :py:const:`~awslimitchecker.limit.SOURCE_TA`, or
            :py:const:`~awslimitchecker.limit.SOURCE_API`
          :rtype: int