<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_courses(self):
 """Gets any courses associated with this activity. return: (osid.course.CourseList) - list of courses raise: IllegalState - ``is_course_based_activity()`` is ``false`` raise: OperationFailed - unable to complete request *compliance: mandatory -- This method must be implemented.* """

        # Implemented from template for osid.learning.Activity.get_assets_template
        if not bool(self._my_map['courseIds']):
            raise errors.IllegalState('no courseIds')
        mgr = self._get_provider_manager('COURSE')
        if not mgr.supports_course_lookup():
            raise errors.OperationFailed('Course does not support Course lookup')

        # What about the Proxy?
        lookup_session = mgr.get_course_lookup_session(proxy=getattr(self, "_proxy", None))
        lookup_session.use_federated_no_catalog_view()
        return lookup_session.get_courses_by_ids(self.get_course_ids())