Fix a few pylint warnings.

src/sugar/activity/activity.py

@@ -49,7 +49,6 @@ import gettext
 import logging
 import os
 import time
-import tempfile
 from hashlib import sha1
 import traceback
 
@@ -469,7 +468,8 @@ class Activity(Window, gtk.Container):
         # watch visibility-notify-events to know when we can safely
         # take a screenshot of the activity
         self.add_events(gtk.gdk.VISIBILITY_NOTIFY_MASK)
-        self.connect('visibility-notify-event', self.__visibility_notify_event_cb)
+        self.connect('visibility-notify-event',
+                     self.__visibility_notify_event_cb)
         self._fully_obscured = True
 
         self._active = False

src/sugar/activity/activityfactory.py

@@ -17,8 +17,6 @@
 # Boston, MA 02111-1307, USA.
 
 import logging
-import subprocess
-import signal
 
 import dbus
 import gobject
@@ -58,14 +56,14 @@ _RAINBOW_ACTIVITY_FACTORY_INTERFACE = "org.laptop.security.Rainbow"
 # borrowed from subprocess.py
 try:
     MAXFD = os.sysconf("SC_OPEN_MAX")
-except:
+except ValueError:
     MAXFD = 256
 def _close_fds():
     for i in xrange(3, MAXFD):
         try:
             os.close(i)
         except:
-            pass
+            logging.error('Cannot close file file descriptors')
 
 def create_activity_id():
     """Generate a new, unique ID for this activity"""