show easy to understand error message on twisted importerror for the not so bright #796

deluge/core/core.py

@@ -30,9 +30,14 @@ import threading
 import pkg_resources
 import base64
 
-from twisted.internet import reactor
-from twisted.internet.task import LoopingCall
-import twisted.web.client
+from deluge.log import LOG as log
+
+try:
+    from twisted.internet import reactor
+    from twisted.internet.task import LoopingCall
+    import twisted.web.client
+except ImportError:
+    log.error("You must install python-twisted")
 
 try:
     import deluge.libtorrent as lt
@@ -54,8 +59,6 @@ from deluge.core.autoadd import AutoAdd
 from deluge.core.authmanager import AuthManager
 from deluge.core.rpcserver import export
 
-from deluge.log import LOG as log
-
 STATUS_KEYS = ['active_time', 'compact', 'distributed_copies', 'download_payload_rate', 'eta',
     'file_priorities', 'file_progress', 'files', 'hash', 'is_auto_managed', 'is_seed', 'max_connections',
     'max_download_speed', 'max_upload_slots', 'max_upload_speed', 'message', 'move_on_completed',

deluge/ui/gtkui/gtkui.py

@@ -26,8 +26,11 @@
 from deluge.log import LOG as log
 
 # Install the twisted reactor
-from twisted.internet import gtk2reactor
-reactor = gtk2reactor.install()
+try:
+    from twisted.internet import gtk2reactor
+    reactor = gtk2reactor.install()
+except ImportError:
+    log.error("You must install python-twisted")
 
 import gobject
 import gettext