[python] Remove `print_evaluation()` function (#4819)

* Update __init__.py

* Update callback.py

python-package/lightgbm/__init__.py

@@ -6,7 +6,7 @@ Contributors: https://github.com/microsoft/LightGBM/graphs/contributors.
 from pathlib import Path
 
 from .basic import Booster, Dataset, Sequence, register_logger
-from .callback import early_stopping, log_evaluation, print_evaluation, record_evaluation, reset_parameter
+from .callback import early_stopping, log_evaluation, record_evaluation, reset_parameter
 from .engine import CVBooster, cv, train
 
 try:
@@ -32,5 +32,5 @@ __all__ = ['Dataset', 'Booster', 'CVBooster', 'Sequence',
            'train', 'cv',
            'LGBMModel', 'LGBMRegressor', 'LGBMClassifier', 'LGBMRanker',
            'DaskLGBMRegressor', 'DaskLGBMClassifier', 'DaskLGBMRanker',
-           'log_evaluation', 'print_evaluation', 'record_evaluation', 'reset_parameter', 'early_stopping',
+           'log_evaluation', 'record_evaluation', 'reset_parameter', 'early_stopping',
            'plot_importance', 'plot_split_value_histogram', 'plot_metric', 'plot_tree', 'create_tree_digraph']

python-package/lightgbm/callback.py

@@ -57,16 +57,6 @@ def _format_eval_result(value: list, show_stdv: bool = True) -> str:
         raise ValueError("Wrong metric value")
 
 
-def print_evaluation(period: int = 1, show_stdv: bool = True) -> Callable:
-    """Create a callback that logs the evaluation results.
-
-    Deprecated, use ``log_evaluation()`` instead.
-    """
-    _log_warning("'print_evaluation()' callback is deprecated and will be removed in a future release of LightGBM. "
-                 "Use 'log_evaluation()' callback instead.")
-    return log_evaluation(period=period, show_stdv=show_stdv)
-
-
 def log_evaluation(period: int = 1, show_stdv: bool = True) -> Callable:
     """Create a callback that logs the evaluation results.