CLN: Remove to_pickle method

Author: bashtage

pandas-stubs/io/pickle.pyi

@@ -5,16 +5,8 @@ from pandas._typing import (
     FilePath,
     ReadPickleBuffer,
     StorageOptions,
-    WriteBuffer,
 )
 
-def to_pickle(
-    obj: object,
-    filepath_or_buffer: FilePath | WriteBuffer[bytes],
-    compression: CompressionOptions = ...,
-    protocol: int = ...,
-    storage_options: StorageOptions = ...,
-) -> None: ...
 def read_pickle(
     filepath_or_buffer: FilePath | ReadPickleBuffer,
     compression: CompressionOptions = ...,

tests/test_io.py

@@ -47,7 +47,6 @@
 
 from tests import check
 
-from pandas.io.api import to_pickle
 from pandas.io.clipboard import PyperclipException
 from pandas.io.common import IOHandles
 from pandas.io.json._json import JsonReader
@@ -125,10 +124,6 @@ def test_pickle():
         check(assert_type(DF.to_pickle(path), None), type(None))
         check(assert_type(read_pickle(path), Any), DataFrame)
 
-    with ensure_clean() as path:
-        check(assert_type(to_pickle(DF, path), None), type(None))
-        check(assert_type(read_pickle(path), Any), DataFrame)
-
 
 def test_pickle_file_handle():
     with ensure_clean() as path: