astral-sh/uv

Show a better error when a uv lockfile is used in `-r`

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#16,192 opened on Oct 8, 2025

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 (3 comments) (4 reactions) (0 assignees)Rust (3,111 forks)batch import
error messageshelp wanted

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Description

e.g., if you try to use uv lock --script action.py then -r action.py.lock

error: Couldn't parse requirement in `action.py.lock` at position 0
  Caused by: no such comparison operator "=", must be one of ~= == != <= >= < > ===
version = 1
        ^^^

We can do better by detecting our own lockfile format

Contributor guide

Research direction
Detect the uv lockfile format early and provide a clear error message when used with r.
Tech stack
rustpython
Domain
cli
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
RustPython
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70