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Update python-web-applications to Flask 3.1.3 and python313 - #893
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martin-martin merged 2 commits intoOct 16, 2026
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Google App Engine decommissioned the python38 runtime, so app.yaml now targets python313, matching the updated tutorial. Pin Flask 3.1.3 and refresh the README's dev-server output to what Flask 3.1.3 prints.
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Oct 16, 2026
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October 16, 2026 17:51
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Brings
python-web-applications/in line with the maintenance update of Python Web Applications: Deploy Your Script as a Flask App.Changes
app.yaml:runtime: python38→runtime: python313. Google App Engine decommissioned thepython38runtime;python313is supported until 2029-10-10 and is what the updated tutorial uses.requirements.txt:Flask==2.1.2→Flask==3.1.3, matching the tutorial'srequirements.txtlisting.README.md: replaced the Flask 1.x dev-server banner (Environment: production, lazy loading) with the output Flask 3.1.3 actually prints.main.pyalready matches the tutorial's final code and needed no change.Verification
Fresh Python 3.13 venv,
pip install -r requirements.txt(Flask 3.1.3, Werkzeug 3.1.9, MarkupSafe 3.0.4), thenpython main.py:GET /→ 200, form renders?celsius=100→Fahrenheit: 212.0,?celsius=-40→-40.0,?celsius=abc→invalid inputruff@0.14.1 format --checkandruff checkpassNot verified: an actual
gcloud app deploy(needs a GCP project).Reviewed by Martin Breuss.
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