Repository navigation
Wrangler version parse issue with Python Workers #290
Description
I am getting a wrangler version error on a fresh setup of Python Workers. The issue is that pywrangler is not parsing the version correctly: It sees the package.json version first, then the installed version of wrangler:
$ npx wrangler --version
npm notice run wandering-cake-1e21@0.0.0 npx
npm notice run 'wrangler' --version
⛅️ wrangler 4.148.0
────────────────────
$ uv run pywrangler dev
...
ERROR wrangler version at least 4.127.1 required, have 0.0.0.
ERROR Update wrangler with: npm install wrangler@latest
As you can see, the project, wandering-cake-1e21, has a default version of 0.0.0. This is causing the wrangler CLI to pick up on this first, instead of the actual version number. I can fix this temporarily by making my library package the same as wrangler (4.148.0).
This was probably introduced by #45.
Solution
It looks like --silent would fix this:
$ npx wrangler --version
npm notice run wandering-cake-1e21@0.0.0 npx
npm notice run 'wrangler' --version
⛅️ wrangler 4.148.0
────────────────────
$ npx --silent wrangler --version
⛅️ wrangler 4.148.0
────────────────────
Full MVP
$ mkdir /tmp/demo-app && cd /tmp/demo-app
$ uvx --from workers-py pywrangler init
...
$ cd wandering-cake-1e21/
$ uv run pywrangler dev
Using CPython 3.12.10
Creating virtual environment at: .venv
Installed 10 packages in 47ms
Using CPython 3.14.7 interpreter at: /usr/bin/python3.14
Creating virtual environment at: .venv-workers
Activate with: source .venv-workers/bin/activate
Using CPython 3.14.2
Creating virtual environment at: .venv-workers/pyodide-venv
Activate with: source .venv-workers/pyodide-venv/bin/activate
INFO Resolved 1 requirements from /tmp/demo-app/wandering-cake-1e21/pylock.toml.
INFO Installing packages into python_modules...
INFO Packages installed in python_modules.
INFO Installing packages into .venv-workers...
INFO Packages installed in .venv-workers.
ERROR wrangler version at least 4.127.1 required, have 0.0.0.
ERROR Update wrangler with: npm install wrangler@latest
$ uv run pywrangler --version
pywrangler, version 1.17.7
$ uv run wrangler --version
⛅️ wrangler 4.148.0
────────────────────
$ grep version package.json
"version": "0.0.0",
# Open editor, replace version with "4.148.0"
$ uv run pywrangler dev
INFO Passing command to npx wrangler: npx --yes wrangler dev
npm notice run wandering-cake-1e21@4.148.0 npx
npm notice run 'wrangler' dev
⛅️ wrangler 4.148.0
────────────────────
╭───────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ [b] open a browser [d] open devtools [e] open local explorer [t] start tunnel [c] clear console [x] to exit │
╰───────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
Attaching additional modules:
┌────────────────────┬────────┬────────────┐
│ Name │ Type │ Size │
├────────────────────┼────────┼────────────┤
│ submodule.py │ python │ 0.05 KiB │
├────────────────────┼────────┼────────────┤
│ Vendored Modules │ │ 107.52 KiB │
├────────────────────┼────────┼────────────┤
│ Total (31 modules) │ │ 107.57 KiB │
└────────────────────┴────────┴────────────┘
⎔ Starting local server...
[wrangler:info] Ready on http://localhost:8787
Activity
ryanking13 commentedon Oct 12, 2026
Thanks for the report!
#291 should fix this.