diff --git a/logtail/frame.py b/logtail/frame.py
index c4a168e..90fe89d 100644
--- a/logtail/frame.py
+++ b/logtail/frame.py
@@ -1,6 +1,6 @@
 # coding: utf-8
 from __future__ import print_function, unicode_literals
-from datetime import datetime
+from datetime import datetime, timezone
 
 from os import path
 import __main__
@@ -11,10 +11,8 @@ def create_frame(record, message, context, include_extra_attributes=False):
     if "request" in r and not isinstance(r["request"], (dict, list, bool, int, float, str)) :
         del r["request"]
     frame = {}
-    # Python 3 only solution if we ever drop Python 2.7
-    # frame['dt'] = datetime.utcfromtimestamp(r['created']).replace(tzinfo=timezone.utc).isoformat()
-    frame['dt'] = "{}+00:00".format(datetime.utcfromtimestamp(r['created']).isoformat())
-    frame['level'] = level = _levelname(r['levelname'])
+    frame['dt'] = datetime.fromtimestamp(r['created'], timezone.utc).isoformat()
+    frame['level'] = _levelname(r['levelname'])
     frame['severity'] = int(r['levelno'] / 10)
     frame['message'] = message
     frame['context'] = ctx = {}
@@ -47,7 +45,7 @@ def _parse_custom_events(record, include_extra_attributes):
     default_keys = {
         'args', 'asctime', 'created', 'exc_info', 'exc_text', 'pathname',
         'funcName', 'levelname', 'levelno', 'lineno', 'module', 'msecs',
-        'message', 'msg', 'name', 'pathname', 'process', 'processName',
+        'message', 'msg', 'name', 'process', 'processName',
         'relativeCreated', 'thread', 'threadName'
     }
     events = {}
diff --git a/logtail/handler.py b/logtail/handler.py
index f76ebfa..89946c9 100644
--- a/logtail/handler.py
+++ b/logtail/handler.py
@@ -68,7 +68,6 @@ def emit(self, record):
                 # Only raised when not blocking, which means that extra events
                 # should be dropped.
                 self.dropcount += 1
-                pass
         except Exception as e:
             if self.raise_exceptions:
                 raise e
diff --git a/tests/test_flusher.py b/tests/test_flusher.py
index 32130b3..bfb3ce6 100644
--- a/tests/test_flusher.py
+++ b/tests/test_flusher.py
@@ -25,12 +25,11 @@ def _setup_worker(self, uploader=None):
         return pipe, uploader, fw
 
     def test_is_thread(self):
-        pipe, uploader, fw = self._setup_worker()
+        _, _, fw = self._setup_worker()
         self.assertIsInstance(fw, threading.Thread)
 
     def test_flushes_when_queue_is_full(self):
         first_frame = list(range(self.buffer_capacity))
-        second_frame = list(range(self.buffer_capacity, self.buffer_capacity * 2))
         self.calls = 0
         self.flush_interval = 1000