[ci][python] apply isort to python-package/lightgbm/__init__.py #3958 (#3966)

python-package/lightgbm/__init__.py

@@ -3,24 +3,24 @@
 
 Contributors: https://github.com/microsoft/LightGBM/graphs/contributors.
 """
+import os
+
 from .basic import Booster, Dataset, register_logger
 from .callback import (early_stopping, print_evaluation, record_evaluation,
                        reset_parameter)
-from .engine import cv, train, CVBooster
-
-import os
+from .engine import CVBooster, cv, train
 
 try:
-    from .sklearn import LGBMModel, LGBMRegressor, LGBMClassifier, LGBMRanker
+    from .sklearn import LGBMClassifier, LGBMModel, LGBMRanker, LGBMRegressor
 except ImportError:
     pass
 try:
-    from .plotting import (plot_importance, plot_split_value_histogram, plot_metric,
-                           plot_tree, create_tree_digraph)
+    from .plotting import (create_tree_digraph, plot_importance, plot_metric,
+                           plot_split_value_histogram, plot_tree)
 except ImportError:
     pass
 try:
-    from .dask import DaskLGBMRegressor, DaskLGBMClassifier, DaskLGBMRanker
+    from .dask import DaskLGBMClassifier, DaskLGBMRanker, DaskLGBMRegressor
 except ImportError:
     pass