CommunityJev Guides & Articles
Real Python: Jev in Python
Philipp Acsany's tutorial replaces a Y-or-N input check with Jev, then asks Noul, Score, and Choice in one call through OpenRouter.
- Format
- Article
- Published by
- Community
- Author
- Philipp Acsany
- Last verified
- Oct 2026
Used inJev for Software & DevTools
- Languages
- Python
- Platforms
- OpenRouter
Highlights
- Updated 24 September 2026. The page estimates 17 minutes and marks the lesson intermediate.
- Starts from a train-station script that only accepts an uppercase Y or N, then replaces that check with a Noul.
- The third step sends a dictionary as state and asks Noul, Score, and Choice in one request.
- Requires Python 3.10 or newer and uv. Pinning a build is shown as model="jev-1.13".
Watch out
The calls go through OpenRouter, not api.typesafe.ai. Real Python also hosts a video of this walkthrough.
Questions about this entry
Short answers drawn from the linked project or page.
Not from here. The fetch was refused, so the source file is empty and the article body was never retrieved. Everything below comes from the entry copy, which records the running example, the three question types and the pinning step but is not a substitute for the code.
The entry copy describes the tutorial starting from a train-station script that only accepts an uppercase Y or N and then swapping that check for a Noul question. It does not claim the old check was broken, so the swap reads as a demonstration of the shape rather than a fix.
OpenRouter. The entry copy is explicit that the calls route through OpenRouter rather than TypeSafe's own endpoint, and the Python requirement is 3.10 or newer with uv. That routing choice changes billing and where you would look for logs.
The tutorial shows pinning as model="jev-1.13", which pins the version you call but not the provider OpenRouter routes you to. The entry copy says nothing about provider pinning, so latency and cost can still drift underneath a fixed model string.
It treats a value above 0.8 as true and below 0.2 as false, and anything in between means Jev is unsure so it asks the visitor again, letting you trade accepting mumbled answers against repeat questions.
The state holds only the visitor's answer, so an instruction like 'Did the user lose something?' gives Jev nothing to judge and scores 'yes' around 0.31; 'Is the answer from the user affirmative?' scores it about 0.98. Fix the instruction before touching the cutoffs.
A Choice for the desk covering ticket counter, lost and found and immediate help, a four-level Score for urgency, and a Noul for whether a staff member is needed, all sent against a dictionary state keyed visitor_says.
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