syntax error python3 after updating and upgrading

Question

When I run the command sudo apt update && sudo apt upgrade, everything upgrades as usual but towards the end I get the error

/usr/lib/python3/dist-packages/pyVNC/Client.py:61: SyntaxWarning: "is" with a literal. Did you mean "=="? if event is "Left": /usr/lib/python3/dist-packages/pyVNC/Client.py:63: SyntaxWarning: "is" with a literal. Did you mean "=="? elif event is "Middle": /usr/lib/python3/dist-packages/pyVNC/Client.py:65: SyntaxWarning: "is" with a literal. Did you mean "=="? elif event is "Right": /usr/lib/python3/dist-packages/pyVNC/Client.py:61: SyntaxWarning: "is" with a literal. Did you mean "=="? if event is "Left": /usr/lib/python3/dist-packages/pyVNC/Client.py:63: SyntaxWarning: "is" with a literal. Did you mean "=="? elif event is "Middle": /usr/lib/python3/dist-packages/pyVNC/Client.py:65: SyntaxWarning: "is" with a literal. Did you mean "=="? elif event is "Right" 

I have tried looking at the code but nothing comes to mind. Any idea on how to fix?

Answer 1

first of all yes it's a warning and not an error, and it's because you're probably using this library https://github.com/cair/pyVNC

and this part (/usr/lib/python3/dist-packages/pyVNC/Client.py:61) is raising a warning:

if event is "Left": button_id = 1 elif event is "Middle": button_id = 2 elif event is "Right": button_id = 4 

As said in the message they should use "==" instead of "is" see this article for more info https://adamj.eu/tech/2020/01/21/why-does-python-3-8-syntaxwarning-for-is-literal/

One other things is why this is raise while updating your OS, probably because you don't use a virtualenv for your python scripts. So i would suggest you to do so : https://docs.python.org/3/library/venv.html