command_context: restore common dict semantics + allow "bypass"

Signed-off-by: Jan Pokorný <jpokorny@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/utils.py b/utils.py
index 00cf5cc..08dbd21 100644
--- a/utils.py
+++ b/utils.py
@@ -46,9 +46,13 @@ filterdict_invpop = \
 
 
 #
-# function introspection related
+# introspection related
 #
 
+def isinstanceexcept(subj, obj, exc=()):
+    return isinstance(subj, obj) and not isinstance(subj, exc)
+
+
 def func_defaults_varnames(func, skip=0):
     """Using introspection, get arg defaults (dict) + all arg names (tuple)