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fix(python): preserve pylance distribution variant

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Gatefixer
2026-08-05 23:29:37 +00:00
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python/README.md
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@@ -8,14 +8,25 @@ A Python library for [LanceDB](https://github.com/lancedb/lancedb).
pip install lancedb
```
The core package does not require PyLance. Install LanceDB's optional PyLance
dependency when you need access to the underlying Lance dataset or
GPU-accelerated indexing:
The core package does not require PyLance. When you need access to the underlying
Lance dataset or GPU-accelerated indexing, add the `pylance` extra to the
distribution you already installed.
For the standard distribution:
```bash
pip install "lancedb[pylance]"
```
For the pre-Haswell compatibility distribution:
```bash
pip install "lancedb-compat[pylance]"
```
Use only the extra matching your installed distribution. Do not install both
distributions because they share the `lancedb` namespace.
### Pre-Haswell x86_64 hosts: `lancedb-compat`
The default `lancedb` wheel targets `x86-64-haswell` (AVX2 + FMA + F16C) for full performance on modern hardware. Pre-Haswell hosts — Intel Sandy Bridge / Ivy Bridge / Westmere; AMD Bulldozer / Piledriver / Steamroller — don't have AVX2 and crash with `Illegal instruction` at `import lancedb`.