Handle None in first.

lgastako · Mar 28, 2013 · 2acbe23 · 2acbe23
1 parent 6df0338
commit 2acbe23
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/mon.py b/mon.py
@@ -21,7 +21,7 @@
 def first(xs):
     try:
         return xs[0]
-    except IndexError:
+    except (IndexError, TypeError):
         if xs is None or len(xs) ==0:
             return None
         raise