diff --git a/ctl b/ctl
index b518cddd..28c74e12 100755
--- a/ctl
+++ b/ctl
@@ -10,6 +10,7 @@ self=`readlink "$0"`
 if [ -z $self ]; then
     self="$0"
 fi
+
 if [ "$action" = "init" ]; then
     cd "`dirname "$self"`"
     BASE=`pwd`
@@ -47,7 +48,15 @@ if [ "$action" = "init" ]; then
     fi
     exit 0
 fi
+
 if [ "$action" = "manage" ]; then
+    cmd="pandora/manage.py"
+fi
+if [ "$action" = "update" ]; then
+    cmd="update.py"
+fi
+
+if [ ! -z $cmd ]; then
     cd "`dirname "$self"`"
     BASE=`pwd`
     SUDO=""
@@ -56,9 +65,10 @@ if [ "$action" = "manage" ]; then
         SUDO="sudo -H -u $PANDORA_USER"
     fi
     shift
-    $SUDO $BASE/pandora/manage.py $@
+    $SUDO "$BASE/$cmd" $@
     exit $?
 fi
+
 if [ `whoami` != 'root' ]; then
     echo you have to be root or run $0 with sudo
     exit 1
diff --git a/pandora/app/utils.py b/pandora/app/utils.py
index f272e6c8..ee2e9d08 100644
--- a/pandora/app/utils.py
+++ b/pandora/app/utils.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import division, with_statement
-
 import time
 
 from .models import Settings
diff --git a/pandora/archive/chunk.py b/pandora/archive/chunk.py
index 148ba24f..8422051e 100644
--- a/pandora/archive/chunk.py
+++ b/pandora/archive/chunk.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import division, with_statement
-
 import os
 
 import ox
diff --git a/pandora/home/apps.py b/pandora/home/apps.py
index 1d6cbbdf..90dc7137 100644
--- a/pandora/home/apps.py
+++ b/pandora/home/apps.py
@@ -1,5 +1,3 @@
-from __future__ import unicode_literals
-
 from django.apps import AppConfig
 
 
diff --git a/pandora/item/data_api.py b/pandora/item/data_api.py
index 81d9d72c..0c06015f 100644
--- a/pandora/item/data_api.py
+++ b/pandora/item/data_api.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import division, with_statement
-
 import ox
 from django.conf import settings
 
diff --git a/pandora/oxdjango/api/__init__.py b/pandora/oxdjango/api/__init__.py
index 4ecadf1d..72294dc6 100644
--- a/pandora/oxdjango/api/__init__.py
+++ b/pandora/oxdjango/api/__init__.py
@@ -1,3 +1 @@
-from __future__ import absolute_import
-
 from .actions import actions
diff --git a/pandora/oxdjango/api/actions.py b/pandora/oxdjango/api/actions.py
index f8a91d3a..70249914 100644
--- a/pandora/oxdjango/api/actions.py
+++ b/pandora/oxdjango/api/actions.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import division, absolute_import
-
 import inspect
 import sys
 
diff --git a/pandora/oxdjango/api/site.py b/pandora/oxdjango/api/site.py
index ddd5bc49..cac1e021 100644
--- a/pandora/oxdjango/api/site.py
+++ b/pandora/oxdjango/api/site.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import
-
 from django.urls import path
 
 from . import views
diff --git a/pandora/oxdjango/api/views.py b/pandora/oxdjango/api/views.py
index 1dfe7428..3a4a2e89 100644
--- a/pandora/oxdjango/api/views.py
+++ b/pandora/oxdjango/api/views.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import division, absolute_import
-
 import json
 
 from django.shortcuts import render
diff --git a/pandora/oxdjango/decorators.py b/pandora/oxdjango/decorators.py
index bd6942e5..e631daef 100644
--- a/pandora/oxdjango/decorators.py
+++ b/pandora/oxdjango/decorators.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import
-
 from functools import wraps
 
 from .shortcuts import render_to_json_response
diff --git a/pandora/sequence/extract.py b/pandora/sequence/extract.py
index 5cbcda50..90db3b33 100644
--- a/pandora/sequence/extract.py
+++ b/pandora/sequence/extract.py
@@ -1,5 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import division
 import os
 
 from PIL import Image
@@ -97,7 +96,9 @@ class DataTimeline():
     def get_frame(self, pos):
         frame = int(pos * self.fps)
         tile = int(frame * 8 / self.timeline_width)
-        if self.current_tile != tile:
+        if len(self.file_names) <= tile:
+            tile = len(self.file_names) - 1
+        if self.current_tile != tile and len(self.file_names):
             self.timeline_image = Image.open(self.file_names[tile])
             self.current_tile = tile
         x = frame * 8 - tile * self.timeline_width
diff --git a/pandora/settings.py b/pandora/settings.py
index 6cb4f347..99eda0ba 100644
--- a/pandora/settings.py
+++ b/pandora/settings.py
@@ -2,7 +2,6 @@
 # Django settings for pan.do/ra project defaults,
 # create local_settings.py to overwrite
 # check pan.do/ra section below for relevant settings
-from __future__ import absolute_import
 
 import os
 from os.path import join, normpath, dirname
diff --git a/pandora/websocket/management/commands/websocketd.py b/pandora/websocket/management/commands/websocketd.py
index 0eb9ed25..f93bc9d6 100644
--- a/pandora/websocket/management/commands/websocketd.py
+++ b/pandora/websocket/management/commands/websocketd.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import
-
 import os
 
 from django.core.management.base import BaseCommand
diff --git a/pandora/websocket/worker.py b/pandora/websocket/worker.py
index 72c35e5a..1a0e633d 100644
--- a/pandora/websocket/worker.py
+++ b/pandora/websocket/worker.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import
+import logging
 
 from django.conf import settings
 
@@ -8,6 +8,7 @@ from kombu.mixins import ConsumerMixin
 
 from . import daemon, key
 
+logger = logging.getLogger('pandora.websocket')
 
 queue = Queue('websocket', Exchange(key, type='direct'), routing_key=key)
 
@@ -22,8 +23,11 @@ class Worker(ConsumerMixin):
                          callbacks=[self.process_task])]
 
     def process_task(self, body, message):
-        if body['task'] == 'trigger_event':
-            daemon.trigger_event(*body['args'])
+        try:
+            if body['task'] == 'trigger_event':
+                daemon.trigger_event(*body['args'])
+        except:
+            logger.error('faild to trigger event %s', body, exc_info=True)
         message.ack()
 
 def run():
diff --git a/scripts/poster.0xdb.py b/scripts/poster.0xdb.py
index bd05982d..9b9f2470 100755
--- a/scripts/poster.0xdb.py
+++ b/scripts/poster.0xdb.py
@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
-from __future__ import division
 import os
 
 from PIL import Image
diff --git a/scripts/poster.indiancinema.py b/scripts/poster.indiancinema.py
index 194700d5..bc37fca5 100755
--- a/scripts/poster.indiancinema.py
+++ b/scripts/poster.indiancinema.py
@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
-from __future__ import division
 import os
 
 from PIL import Image
diff --git a/scripts/poster.padma.py b/scripts/poster.padma.py
index 81ec3dfe..015aaa9b 100755
--- a/scripts/poster.padma.py
+++ b/scripts/poster.padma.py
@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
-from __future__ import division
 import os
 
 from PIL import Image
diff --git a/scripts/poster.pandora.py b/scripts/poster.pandora.py
index 6177efd8..5f196562 100755
--- a/scripts/poster.pandora.py
+++ b/scripts/poster.pandora.py
@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
-from __future__ import division
 import os
 
 from PIL import Image
diff --git a/update.py b/update.py
index 566d23f9..3a2c7a40 100755
--- a/update.py
+++ b/update.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-from __future__ import print_function
 import json
 import os
 import shutil