Less clumsy implementation of has_edge_id.

topydo/lib/Graph.py

 # Topydo - A todo.txt client written in Python.
 # Copyright (C) 2014 Bram Schoenmakers <me@bramschoenmakers.nl>
-# 
+#
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
-# 
+#
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
-# 
+#
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
@@ -141,8 +141,7 @@ class DirectedGraph(object):
         """
         Returns True if the client registered an edge with the given id.
         """
-        l = [e for e in self._edge_numbers.itervalues() if e == p_id]
-        return len(l) > 0
+        return p_id in self._edge_numbers.values()
 
     def edge_id(self, p_from, p_to):
         """