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uv/docs
Ahmed Ilyas bbd9adaa40 Env variables for python downloads (#6416)
## Summary

Resolves #6406

## Test Plan

```
❯ UV_PYTHON_PREFERENCE=only-managed cargo run -q -- sync --show-settings | rg python_preference
    python_preference: OnlyManaged,
❯ UV_PYTHON_PREFERENCE=system cargo run -q -- sync --show-settings | rg python_preference
    python_preference: System,
❯ UV_NO_PYTHON_DOWNLOADS=1 cargo run -q -- sync --show-settings | rg python_downloads
    python_downloads: Never,
❯ UV_ALLOW_PYTHON_DOWNLOADS=1 cargo run -q -- sync --show-settings | rg python_downloads
    python_downloads: Automatic,
```
2024-08-22 08:52:52 -04:00
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