New "with ignored(*exceptions)" context manager

jedi/keywords.py

@@ -1,7 +1,10 @@
+from __future__ import with_statement
+
 import pydoc
 import keyword
 
 from jedi._compatibility import is_py3k
+from jedi import common
 import builtin
 
 try:
@@ -63,12 +66,10 @@ def imitate_pydoc(string):
     # with unicode strings)
     string = str(string)
     h = pydoc.help
-    try:
+    with common.ignored(KeyError):
         # try to access symbols
         string = h.symbols[string]
         string, _, related = string.partition(' ')
-    except KeyError:
-        pass
 
     get_target = lambda s: h.topics.get(s, h.keywords.get(s))
     while isinstance(string, str):