diff -up yawn-20140318/pywbem_yawn/__init__.py.orig yawn-20140318/pywbem_yawn/__init__.py
--- yawn-20140318/pywbem_yawn/__init__.py.orig	2019-05-13 12:21:52.984356124 +0200
+++ yawn-20140318/pywbem_yawn/__init__.py	2019-05-13 12:30:22.246973082 +0200
@@ -478,10 +478,10 @@ class Yawn(object):
                             namespace=namespaces[ins])
                     interopns = namespaces[ins]
                     nsclass = nsclasses[icls]
-                except pywbem.CIMError, arg:
-                    if arg[0] in [pywbem.CIM_ERR_INVALID_NAMESPACE,
-                                  pywbem.CIM_ERR_NOT_SUPPORTED,
-                                  pywbem.CIM_ERR_INVALID_CLASS]:
+                except pywbem.CIMError as arg:
+                    if arg.args[0] in [pywbem.CIM_ERR_INVALID_NAMESPACE,
+                                       pywbem.CIM_ERR_NOT_SUPPORTED,
+                                       pywbem.CIM_ERR_INVALID_CLASS]:
                         continue
                     else:
                         raise
diff -up yawn-20140318/pywbem_yawn/inputparse.py.orig3 yawn-20140318/pywbem_yawn/inputparse.py
--- yawn-20140318/pywbem_yawn/inputparse.py.orig3	2013-04-26 09:45:08.000000000 +0200
+++ yawn-20140318/pywbem_yawn/inputparse.py	2019-05-13 13:23:25.449769078 +0200
@@ -20,7 +20,7 @@ Utilities and functions for parsing user
 """
 
 import base64
-import cPickle
+import pickle
 import pywbem
 import re
 import zlib
@@ -50,7 +50,7 @@ def decode_reference(encoded_text):
     Decompress object path to python object.
     """
     try:
-        return cPickle.loads(zlib.decompress(base64.urlsafe_b64decode(
+        return pickle.loads(zlib.decompress(base64.urlsafe_b64decode(
             encoded_text)))
     except Exception:
         raise ReferenceDecodeError(path=encoded_text)
diff -up yawn-20140318/pywbem_yawn/render.py.orig3 yawn-20140318/pywbem_yawn/render.py
--- yawn-20140318/pywbem_yawn/render.py.orig3	2013-01-18 11:14:45.000000000 +0100
+++ yawn-20140318/pywbem_yawn/render.py	2019-05-13 13:22:57.113734091 +0200
@@ -19,7 +19,7 @@
 Utilities and functions for template rendering.
 """
 import base64
-import cPickle
+import pickle
 import datetime
 from collections import defaultdict
 import mako.lookup
@@ -227,7 +227,7 @@ def encode_reference(obj):
     @return compressed and encoded object.
     """
     return base64.urlsafe_b64encode(
-            zlib.compress(cPickle.dumps(obj, cPickle.HIGHEST_PROTOCOL)))
+            zlib.compress(pickle.dumps(obj, pickle.HIGHEST_PROTOCOL)))
 
 def val2str(value):
     """