make current code with python 3.6 compatible

Signed-off-by: hwassman <[email protected]>

Author: Helene

source/collector.py

@@ -25,7 +25,7 @@
 from queryHandler.Query import Query
 from messages import MSG
 from collections import defaultdict
-from typing import Optional, Any
+from typing import Optional, Any, List
 from threading import Thread
 from metadata import MetadataHandler
 from bridgeLogger import getBridgeLogger
@@ -150,7 +150,7 @@ def setup_static_metrics_data(self, include_metrics: Optional[list] = None,
         else:
             self._setup_static_metrics_data(metrics)
 
-    def _setup_static_metrics_data(self, metric_names: list[str]):
+    def _setup_static_metrics_data(self, metric_names: List[str]):
         mDict = {}
         md = MetadataHandler()
         spec = md.metricsDesc

source/opentsdb.py

@@ -26,6 +26,7 @@
 from collections import defaultdict
 from collector import SensorCollector, QueryPolicy
 from utils import getTimeMultiplier
+from typing import List
 
 
 class OpenTsdbApi(object):
@@ -47,7 +48,7 @@ def qh(self):
     def TOPO(self):
         return self.__md.metaData
 
-    def format_response(self, data: dict, jreq: dict) -> list[dict]:
+    def format_response(self, data: dict, jreq: dict) -> List[dict]:
         respList = []
         for name, metric in data.items():
             for st in metric.timeseries:
@@ -60,7 +61,7 @@ def format_response(self, data: dict, jreq: dict) -> list[dict]:
                 respList.append(res.__dict__)
         return respList
 
-    def query(self, jreq: dict) -> list[dict]:
+    def query(self, jreq: dict) -> List[dict]:
         resp = []
         collectors = []