Python 3.14 removed ast.Str

[Manos Pappas]

Hello,

I have a jam v5 application that I am in the process of converting to v7.

My setup uses two venv's, one for jam v5 and one for jam v7, so that I can easily switch between environments.

The system Python is 3.14 which removed support for ast.Str which is referenced on v5 werkzeug/routing.py module. The suggested solution is to replace ast.Str with ast.Constant but this does not work.

Any ideas what to do in order to overcome this?

Many thanks in advance,

Manos Pappas

[Dean D. Babic]

Hi, 

I managed to install pyenv-win after this on PS (as admin):
Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy Unrestricted

PS C:\Windows\system32> pyenv install 3.13
:: [Info] ::  Mirror: https://www.python.org/ftp/python
:: [Info] ::  Mirror: https://downloads.python.org/pypy/versions.json
:: [Info] ::  Mirror: https://api.github.com/repos/oracle/graalpython/releases
:: [Downloading] ::  3.13.11 ...
:: [Downloading] ::  From https://www.python.org/ftp/python/3.13.11/python-3.13.11-amd64.exe
:: [Downloading] ::  To   C:\Users\dba\.pyenv\pyenv-win\install_cache\python-3.13.11-amd64.exe
:: [Installing] ::  3.13.11 ...
:: [Info] :: completed! 3.13.11
PS C:\Windows\system32> pyenv local 3.13.11

PS C:\Windows\system32> cd C:\Users\dba\Downloads\demo_v5\jam-py-master\jam-py-master\demo

PS C:\Users\dba\Downloads\demo_v5\jam-py-master\jam-py-master\demo> pip install jam.py-v5 standard-imghdr
Collecting jam.py-v5
  Using cached jam.py_v5-5.5.4-py3-none-any.whl.metadata (7.1 kB)
Collecting standard-imghdr
  Using cached standard_imghdr-3.13.0-py3-none-any.whl.metadata (862 bytes)
Using cached jam.py_v5-5.5.4-py3-none-any.whl (2.2 MB)
Using cached standard_imghdr-3.13.0-py3-none-any.whl (4.6 kB)
Installing collected packages: standard-imghdr, jam.py-v5
Successfully installed jam.py-v5-5.5.4 standard-imghdr-3.13.0

[notice] A new release of pip is available: 25.3 -> 26.0.1
[notice] To update, run: python.exe -m pip install --upgrade pip

That's it. Run Jam.py.

Install 3.14 in new PS and you'll have both. Impossible to run on one Python install otherwise.

Good luck.

[Manos Pappas]

Hi,

Thank you for the suggestion.

I've ended up using uv to create two virtual environments using Python 3.13, one for Jam v5 and one for Jam v7.

I can start the v5 application now and use this paradigm in order to rewrite it for v7.

Kind regards,

Manos