An error module 'ast' has no attribute 'Str' when use Python 3.14 to launch Flask/Jade Web Project.

[linette-zyy]

Environment

Steps to Reproduce

1. Create a Flask/Jade Web Project.
2. Use Python3.14 to create virtual environment.
3. After following those steps
   Failed to launch Flask/Jade Web Project #8242 (comment)
4. Press F5 to launch the project.

Expected behavior
The project was launched successfully without any error.

Additional context and screenshots
It prompt module 'ast' has no attribute 'Str'

[StellaHuang95]

This is because PyJade is unmaintained and incompatible with 3.14. and it (or one of its dependencies) was compiled/written for older Python versions that had these AST nodes (ast.Str, ast.Num, ast.NameConstant).

The quickest fix is just to downgrade to older version of Python, the long term fix would be to rewrite the template to use other packages.