New "with ignored(*exceptions)" context manager

jedi/evaluate_representation.py

@@ -9,6 +9,8 @@ instantiated. This class represents these cases.
 So, why is there also a ``Class`` class here? Well, there are decorators and
 they change classes in Python 3.
 """
+from __future__ import with_statement
+
 import copy
 import itertools
 
@@ -61,10 +63,8 @@ class Instance(use_metaclass(cache.CachedMetaClass, Executable)):
         else:
             # need to execute the __init__ function, because the dynamic param
             # searching needs it.
-            try:
+            with common.ignored(KeyError):
                 self.execute_subscope_by_name('__init__', self.var_args)
-            except KeyError:
-                pass
         # Generated instances are classes that are just generated by self
         # (No var_args) used.
         self.is_generated = False
@@ -804,10 +804,8 @@ class Array(use_metaclass(cache.CachedMetaClass, pr.Base)):
                 if isinstance(index, Instance) \
                             and str(index.name) in ['int', 'str'] \
                             and len(index.var_args) == 1:
-                    try:
+                    with common.ignored(KeyError, IndexError):
                         return self.get_exact_index_types(index.var_args[0])
-                    except (KeyError, IndexError):
-                        pass
 
         result = list(self._follow_values(self._array.values))
         result += dynamic.check_array_additions(self)