Modify an existing app coded with an old viktor version

[stannecerto]

After following the tutorials, I am modifying the ‘CPT-interpreter’ app that was written with an old version of Viktor/python (3.7).

When I attempt using viktor’s parametrization.pyi classes and functions (such as @DataView, Image, ect.) these are not readly available and I get the following error message: “ERROR : cannot import name ‘Image’ from ‘viktor.parametrization’ (C:\Users***\viktor-apps\sample-cpt-interpreter-main\venv\Lib\site-packages\viktor\parametrization.cp311-win_amd64.pyd)”.

I attempted running the following instructions but I guess did not succeed ( SDK - Deprecations & Upgrades | VIKTOR Documentation) .

Can you please help me understand/identify what part am I missing? or provide some steps to follow in order to upgrade/update the app or being able to use the new viktor’s features?

[matthijs]

hi @stannecerto,
Welcome to the community!

When you get import errors it probably means that the version of viktor that you have installed does not contain these objects. You can see in the changelog what was introduced in what version.

Make sure to update the version of viktor inside your requirements.txt file and after that perform viktor-cli install to install this updated version.

The latest version is 14.7.0:

• if you app was on any version starting with 14 than you can just change the number and it works
• if your app was on a version starting with 13, you can follow this guide: SDK - Migrate (v13 to v14) | VIKTOR Documentation
• if your app was on a version starting with 12, you first need to follow the guide to go from 12 → 13: SDK - Migrate (v12 to v13) | VIKTOR Documentation

hope this helps
cheers,
Matthijs

[matthijs]

PS: make sure that you also upgrade python to at least 3.8, since VIKTOR versions 14 only support this python and higher (the current latest python version is 3.12)