diff --git a/IPython/config/loader.py b/IPython/config/loader.py
index 5f16b4a..efc61e0 100644
--- a/IPython/config/loader.py
+++ b/IPython/config/loader.py
@@ -242,7 +242,7 @@ class Config(dict):
 
     def __deepcopy__(self, memo):
         import copy
-        return type(self)(copy.deepcopy(self.items()))
+        return type(self)(copy.deepcopy(list(self.items())))
     
     def __getitem__(self, key):
         # We cannot use directly self._is_section_key, because it triggers
diff --git a/IPython/core/formatters.py b/IPython/core/formatters.py
index abb3cd2..895b419 100644
--- a/IPython/core/formatters.py
+++ b/IPython/core/formatters.py
@@ -168,7 +168,7 @@ class DisplayFormatter(Configurable):
     @property
     def format_types(self):
         """Return the format types (MIME types) of the active formatters."""
-        return self.formatters.keys()
+        return list(self.formatters.keys())
 
 
 #-----------------------------------------------------------------------------