From af43a60308711b00e40f58255396cb54fca16bd6 Mon Sep 17 00:00:00 2001
From: Brock <jbrockmendel@gmail.com>
Date: Mon, 2 Oct 2023 08:11:41 -0700
Subject: [PATCH 1/2] DEPR: create_block_manager_from_blocks

---
 pandas/core/internals/__init__.py  | 13 ++++++++++++-
 pandas/tests/internals/test_api.py | 14 +++++++++++++-
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/pandas/core/internals/__init__.py b/pandas/core/internals/__init__.py
index 284f8ef135d99..cabe2b0611041 100644
--- a/pandas/core/internals/__init__.py
+++ b/pandas/core/internals/__init__.py
@@ -16,7 +16,6 @@
 from pandas.core.internals.managers import (
     BlockManager,
     SingleBlockManager,
-    create_block_manager_from_blocks,
 )
 
 __all__ = [
@@ -41,6 +40,18 @@ def __getattr__(name: str):
 
     from pandas.util._exceptions import find_stack_level
 
+    if name == "create_block_manager_from_blocks":
+        # GH#33892
+        warnings.warn(
+            f"{name} is deprecated and will be removed in a future version. "
+            "Use public APIs instead.",
+            DeprecationWarning,
+            stacklevel=find_stack_level(),
+        )
+        from pandas.core.internals.managers import create_block_manager_from_blocks
+
+        return create_block_manager_from_blocks
+
     if name in ["NumericBlock", "ObjectBlock"]:
         warnings.warn(
             f"{name} is deprecated and will be removed in a future version. "
diff --git a/pandas/tests/internals/test_api.py b/pandas/tests/internals/test_api.py
index 5cd6c718260ea..ffc672cc748be 100644
--- a/pandas/tests/internals/test_api.py
+++ b/pandas/tests/internals/test_api.py
@@ -4,6 +4,7 @@
 """
 
 import pandas as pd
+import pandas._testing as tm
 from pandas.core import internals
 from pandas.core.internals import api
 
@@ -37,7 +38,6 @@ def test_namespace():
         "SingleBlockManager",
         "SingleArrayManager",
         "concatenate_managers",
-        "create_block_manager_from_blocks",
     ]
 
     result = [x for x in dir(internals) if not x.startswith("__")]
@@ -51,3 +51,15 @@ def test_make_block_2d_with_dti():
 
     assert blk.shape == (1, 3)
     assert blk.values.shape == (1, 3)
+
+
+def test_create_block_manager_from_blocks_deprecated():
+    # GH#33892
+    # If they must, downstream packages should get this from internals.api,
+    #  not internals.
+    msg = (
+        "create_block_manager_from_blocks is deprecated and will be "
+        "removed in a future version. Use public APIs instead"
+    )
+    with tm.assert_produces_warning(DeprecationWarning, match=msg):
+        internals.create_block_manager_from_blocks

From 561354d29f4f98f7da1a0a657553ef6d840f7212 Mon Sep 17 00:00:00 2001
From: Brock <jbrockmendel@gmail.com>
Date: Mon, 2 Oct 2023 12:39:15 -0700
Subject: [PATCH 2/2] lint fixup

---
 pandas/core/internals/__init__.py | 2 --
 1 file changed, 2 deletions(-)

diff --git a/pandas/core/internals/__init__.py b/pandas/core/internals/__init__.py
index cabe2b0611041..0f8cb9f053174 100644
--- a/pandas/core/internals/__init__.py
+++ b/pandas/core/internals/__init__.py
@@ -30,8 +30,6 @@
     "SingleBlockManager",
     "SingleArrayManager",
     "concatenate_managers",
-    # this is preserved here for downstream compatibility (GH-33892)
-    "create_block_manager_from_blocks",
 ]