The callback (at least) is not python3 compatible.

[fcharlier]

Raises errors trying to serialize bytes from comments.

 [WARNING]: Failure using method (v2_playbook_on_play_start) in callback plugin (</home/naz/eNovance/git/DCI/dci-
ansible/callback/dci.CallbackModule object at 0x7f85e48f8a58>): b'success' is not JSON serializable

Which is fixed by the following:

--- a/callback/dci.py
+++ b/callback/dci.py
@@ -178,7 +178,7 @@ class CallbackModule(CallbackBase):
             # If no name has been specified to the play, play.name is equal
             # to the hosts value
             elif play.name and play.name not in play.hosts:
-                comment = play.name.encode('UTF-8')
+                comment = play.name #play.name.encode('UTF-8')
             else:
                 comment = ''

Also throws a bunch of exceptions after running:

Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at 0x7f0eb5f15268>
Traceback (most recent call last):
  File "/home/naz/.virtualenvs/dci/lib64/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable
Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at 0x7f0eb5f15268>
Traceback (most recent call last):
  File "/home/naz/.virtualenvs/dci/lib64/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable
Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at 0x7f0eb5f15268>
Traceback (most recent call last):
  File "/home/naz/.virtualenvs/dci/lib64/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable
Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at 0x7f0eb5f15268>
Traceback (most recent call last):
  File "/home/naz/.virtualenvs/dci/lib64/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable
Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at 0x7f0eb5f15268>
Traceback (most recent call last):
  File "/home/naz/.virtualenvs/dci/lib64/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable
Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at 0x7f0eb5f15268>
Traceback (most recent call last):
  File "/home/naz/.virtualenvs/dci/lib64/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable
Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at 0x7f0eb5f15268>
Traceback (most recent call last):
  File "/home/naz/.virtualenvs/dci/lib64/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable