refactor: lint fixes

Author: apotterri

_appmap/event.py

@@ -94,7 +94,8 @@ def _describe_schema(name, val, depth, max_depth):
     if islist:
         elts = [(None, v) for v in val]
         schema_key = "items"
-    elif isdict:
+    else:
+        assert isdict
         elts = val.items()
         schema_key = "properties"
 

_appmap/recorder.py

@@ -114,7 +114,8 @@ def stop_recording(cls):
     def check_time(cls, event_time):
         if _MAX_TIME is None:
             return
-        if event_time - cls.get_current()._start_time > _MAX_TIME:
+        delta = event_time - cls.get_current()._start_time  # pylint: disable=protected-access
+        if delta > _MAX_TIME:
             raise AppMapSessionTooLong(f"Session exceeded {_MAX_TIME} seconds")
 
     @classmethod

pylintrc

@@ -1,6 +1,6 @@
 [MAIN]
 # Specify a score threshold under which the program will exit with error.
-fail-under=9.86
+fail-under=9.87
 
 
 # Analyse import fallback blocks. This can be used to support both Python 2 and