[python-package] fix mypy error from Dataset.pandas_categorical (#6098)

microsoft · Sep 19, 2023 · 646dfed · 646dfed
1 parent 5792b5b
commit 646dfed
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/python-package/lightgbm/basic.py b/python-package/lightgbm/basic.py
@@ -1593,7 +1593,7 @@ def __init__(
         self.used_indices: Optional[List[int]] = None
         self._need_slice = True
         self._predictor: Optional[_InnerPredictor] = None
-        self.pandas_categorical = None
+        self.pandas_categorical: Optional[List[List]] = None
         self._params_back_up = None
         self.version = 0
         self._start_row = 0  # Used when pushing rows one by one.