Respond to review - move files around

Signed-off-by: Vasily Litvinov <vasilij.n.litvinov@intel.com>

Author: vnlitvinov

pandas/api/__init__.py

@@ -1,5 +1,6 @@
 """ public toolkit API """
 from pandas.api import (  # noqa:F401
+    exchange,
     extensions,
     indexers,
     types,

pandas/api/exchange/__init__.py

@@ -0,0 +1,8 @@
+"""
+Public API for DataFrame exchange protocol.
+"""
+
+from pandas.core.exchange.implementation import from_dataframe
+from pandas.core.exchange.dataframe_protocol import DataFrame
+
+__all__ = ["from_dataframe", "DataFrame"]

pandas/core/exchange/__init__.py

@@ -1,3 +1,7 @@
+"""
+A verbatim copy (vendored) of the spec from https://github.com/data-apis/dataframe-api
+"""
+
 from typing import Tuple, Optional, Dict, Any, Iterable, Sequence, TypedDict
 import enum
 from abc import ABC, abstractmethod

pandas/api/exchange/dataframe_protocol.py renamed to pandas/core/exchange/dataframe_protocol.py

@@ -3,7 +3,7 @@
 
 from typing import Tuple, Any
 
-from .dataframe_protocol import (
+from pandas.core.exchange.dataframe_protocol import (
     Buffer,
     Column,
     ColumnNullType,

pandas/api/exchange/implementation.py renamed to pandas/core/exchange/implementation.py

@@ -204,8 +204,6 @@
     nargsort,
 )
 
-from pandas.api.exchange.dataframe_protocol import DataFrame as DataFrameXchg
-
 from pandas.io.common import get_handle
 from pandas.io.formats import (
     console,
@@ -223,7 +221,7 @@
     from pandas.core.groupby.generic import DataFrameGroupBy
     from pandas.core.internals import SingleDataManager
     from pandas.core.resample import Resampler
-
+    from pandas.core.exchange.dataframe_protocol import DataFrame as DataFrameXchg
     from pandas.io.formats.style import Styler
 
 # ---------------------------------------------------------------------
@@ -814,8 +812,9 @@ def __init__(
         NDFrame.__init__(self, mgr)
 
     # ----------------------------------------------------------------------
-    def __dataframe__(self, nan_as_null : bool = False,
-                  allow_copy : bool = True) -> DataFrameXchg:
+    def __dataframe__(
+        self, nan_as_null: bool = False, allow_copy: bool = True
+    ) -> DataFrameXchg:
         """
         Return the dataframe exchange object implementing the exchange protocol.
 
@@ -825,7 +824,8 @@ def __dataframe__(self, nan_as_null : bool = False,
         https://data-apis.org/dataframe-protocol/latest/index.html
         """
 
-        from pandas.api.exchange.implementation import _PandasDataFrameXchg
+        from pandas.core.exchange.implementation import _PandasDataFrameXchg
+
         return _PandasDataFrameXchg(self, nan_as_null, allow_copy)
 
     # ----------------------------------------------------------------------

pandas/core/frame.py

@@ -1,6 +1,6 @@
 import pytest
 import pandas as pd
-from pandas.api.exchange.implementation import _from_dataframe
+from pandas.core.exchange.implementation import _from_dataframe
 
 
 @pytest.fixture(scope="package")

pandas/tests/api/conftest.py renamed to pandas/tests/exchange/conftest.py

@@ -1,3 +1,6 @@
+"""
+A verbatim copy (vendored) of the spec tests from https://github.com/data-apis/dataframe-api
+"""
 import pytest
 import math
 import ctypes