Fix and deprecate the classes in Mythtv.utility.altdict.py

The classes 'DictInvert' and 'DictInvertCI' from this module will be
removed after MythTV v32 release, use the imports
'from MythTV.altdict import DictInvert, DictInvertCI.", instead.

The class 'OrdDict' from the module 'Mythtv.utility.altdict' will be
removed after MythTV v32 release, use the class 'OrderedDict' from
the module 'collections' provided by python3.

Note: MythTV provides the class 'OrdDict' already in the module
MythTV.altdict. There is no need to duplicate or shadow the same
functionality.

Refs #422

mythtv/bindings/python/MythTV/utility/altdict.py

@@ -4,7 +4,15 @@
 # Description: Provides various custom dict-like classes
 #------------------------------
 
+# Important Note: The classes provided by this module are considered deprecated and will be
+#                 removed after the release of MythTV v32!
+#                 Please use the class 'OrderedDict' from the module 'collections' provided
+#                 by python3.
+#                 For the classes 'DictInvert' and 'DictInvertCI', please use the imports
+#                 'from MythTV.altdict import DictInvert, DictInvertCI'
+
 from builtins import map, zip
+from warnings import warn
 
 class OrdDict( dict ):
     """
@@ -42,13 +50,16 @@ def __delattr__(self, name):
             del self[name]
 
     def __delitem__(self, key):
-        dict.__delitem(self, key)
+        dict.__delitem__(self, key)
         self._field_order.remove(key)
 
     def __iter__(self):
         return self.itervalues()
 
     def __init__(self, data=()):
+        warn("Class 'OrdDict' from this module  will be removed after MythTV v32 release, "
+             "use the class 'OrderedDict' from the module 'collections' provided by python3.",
+             DeprecationWarning, 2)
         dict.__init__(self)
         self._field_order = []
         for k,v in data:
@@ -93,9 +104,13 @@ class DictInvert(dict):
     """
 
     def __init__(self, other, mine=None):
+        warn("Classes 'DictInvert' and 'DictInvertCI' from this module  will be removed "
+             "after MythTV v32 release, "
+             "use the imports 'from MythTV.altdict import DictInvert, DictInvertCI.",
+             DeprecationWarning, 2)
         self.other = other
         if mine is None:
-            mine = dict(zip(*reversed(zip(*other.items()))))
+            mine = dict(zip(*reversed(list(zip(*other.items())))))
         dict.__init__(self, mine)
 
     @classmethod