[ci] fix build python

[shiyu1994]

The python package installation from source with build-python.sh will always install the latest released version.

LightGBM/build-python.sh

Line 362 in 20975ba

lightgbm

Change this to install the built tar.gz file.

[jameslamb]

What led to this PR? What evidence do you have that build-python.sh is installing the latest release instead of the development version?

The use of pip install --find-links=. should mean that the script only looks for the package locally.

You can test this for yourself like this:

echo "raise RuntimeError('beep boop')" >> python-package/lightgbm/__init__.py

sh build-python.sh install

You should see a line like the following confirming that it's the release version (4.0.0.99) being installed

Successfully installed lightgbm-4.0.0.99 numpy-1.25.2 scipy-1.11.1

And then that error when importing, proving that the version built from local was installed

python -c "import lightgbm"

Traceback (most recent call last):
File "", line 1, in
File "/Users/James.Lamb/miniconda3/lib/python3.9/site-packages/lightgbm/init.py", line 37, in
raise RuntimeError('beep boop')
RuntimeError: beep boop

[shiyu1994]

Sorry, somehow I erroneously thought that v4.0.0 was installed instead of v4.0.0.99. After checking again, the current script works just fine. Close this.

[github-actions]

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