[python-package] use _DatasetHandle type hint #5740
Merged
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Contributes to #3756.
Sorry, in #5722 I forgot that the Python package already has a type alias,
_DatasetHandle
, that we use for type hints on things that areDataset
handles (see #5458 (comment)).LightGBM/python-package/lightgbm/basic.py
Line 32 in 42df0ff
This PR switches to using that.