Python 3.5 to be upgraded?

[S3phi40T]

Guys,

I'm experiencing issue with Python.

Code:

Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at                                                                                                                                                              0xf691d3d8>
Traceback (most recent call last):
 File "/usr/lib/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable
Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at                                                                                                                                                              0xf691d3d8>
Traceback (most recent call last):
 File "/usr/lib/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable

As per my google-fu, it's due to python 3.5 and it's resolved in later versions.
Any ideas?