<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(self, query, sort, page, size):
 """Get a list of all the communities. .. http:get:: /communities/(string:id) Returns a JSON list with all the communities. **Request**: .. sourcecode:: http GET /communities HTTP/1.1 Accept: application/json Content-Type: application/json Host: localhost:5000 :reqheader Content-Type: application/json **Response**: .. sourcecode:: http HTTP/1.0 200 OK Content-Length: 334 Content-Type: application/json [ { "id": "comm1" }, { "id": "comm2" } ] :resheader Content-Type: application/json :statuscode 200: no error """

        urlkwargs = {
            'q': query,
            'sort': sort,
            'size': size,
        }

        communities = Community.filter_communities(query, sort)
        page = communities.paginate(page, size)

        links = default_links_pagination_factory(page, urlkwargs)

        links_headers = map(lambda key: ('link', 'ref="{0}" href="{1}"'.format(
            key, links[key])), links)

        return self.make_response(
            page,
            headers=links_headers,
            links_item_factory=default_links_item_factory,
            page=page,
            urlkwargs=urlkwargs,
            links_pagination_factory=default_links_pagination_factory,
        )