Style guide cleanup

backend/app/rest_api/rest.py

@@ -315,7 +315,7 @@ class ExpressionAPI(Resource):
         args = request.get_json()
         cell_list = args.get('celllist', [])
         gene_list = args.get('genelist', [])
-        if not (cell_list) and not (gene_list):
+        if not cell_list and not gene_list:
             return make_payload([], "must include celllist and/or genelist parameter", 400)
 
         expression_data = data.expression(cell_list, gene_list)
@@ -327,6 +327,7 @@ class ExpressionAPI(Resource):
 
         return make_payload(expression_data)
 
+
 class DifferentialExpressionAPI(Resource):
     @swagger.doc({
         'summary': 'Get the top expressed genes for two cell sets. Calculated using t-test',
@@ -429,6 +430,7 @@ class DifferentialExpressionAPI(Resource):
         data = data.diffexp(cell_list_1, cell_list_2, pval, num_genes)
         return make_payload(data)
 
+
 def get_api_resources():
     bp = Blueprint('api', __name__, url_prefix='/api/v2.0')
     api = Api(bp, add_api_spec_resource=False)
@@ -436,4 +438,4 @@ def get_api_resources():
     api.add_resource(CellsAPI, "/cells")
     api.add_resource(ExpressionAPI, "/expression")
     api.add_resource(DifferentialExpressionAPI, "/diffexp")
-    return api
+    return api