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Add hint on build backend import with preview disabled (#9691)

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See #9686

```
❯ uv run python -c "import uv; uv.build_sdist"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/zb/workspace/uv/python/uv/__init__.py", line 45, in __getattr__
    raise AttributeError(err)
AttributeError: Using `uv.build_sdist` is not allowed. The uv build backend requires preview mode to be 
                enabled, e.g., via the `UV_PREVIEW=1` environment variable.

❯ uv run python -c "import uv; uv.foo"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/zb/workspace/uv/python/uv/__init__.py", line 48, in __getattr__
    raise AttributeError(err)
AttributeError: module 'uv' has no attribute 'foo'

❯ uv run python -c "import uv; uv.find_uv_bin"
```
This commit is contained in:
Zanie Blue 2024-12-06 14:08:00 -06:00 • committed by GitHub
parent 3aaa9594be
commit 7a885eaa09
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1 changed files with 18 additions and 0 deletions
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18
python/uv/__init__.py
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@ -28,3 +28,21 @@ if os.environ.get("UV_PREVIEW"):
]
else:
__all__ = ["find_uv_bin"]
def __getattr__(attr_name: str) -> object:
if attr_name in {
"build_sdist",
"build_wheel",
"build_editable",
"get_requires_for_build_sdist",
"get_requires_for_build_wheel",
"prepare_metadata_for_build_wheel",
"get_requires_for_build_editable",
"prepare_metadata_for_build_editable",
}:
err = f"Using `uv.{attr_name}` is not allowed. The uv build backend requires preview mode to be enabled, e.g., via the `UV_PREVIEW=1` environment variable."
raise AttributeError(err)
err = f"module 'uv' has no attribute '{attr_name}'"
raise AttributeError(err)