move _get_cython_table_params into pandas/_testing.py (#32981)

Author: SaturnFromTitan

pandas/_testing.py

@@ -2662,3 +2662,34 @@ def external_error_raised(
     import pytest
 
     return pytest.raises(expected_exception, match=None)
+
+
+cython_table = pd.core.base.SelectionMixin._cython_table.items()
+
+
+def get_cython_table_params(ndframe, func_names_and_expected):
+    """
+    Combine frame, functions from SelectionMixin._cython_table
+    keys and expected result.
+
+    Parameters
+    ----------
+    ndframe : DataFrame or Series
+    func_names_and_expected : Sequence of two items
+        The first item is a name of a NDFrame method ('sum', 'prod') etc.
+        The second item is the expected return value.
+
+    Returns
+    -------
+    list
+        List of three items (DataFrame, function, expected result)
+    """
+    results = []
+    for func_name, expected in func_names_and_expected:
+        results.append((ndframe, func_name, expected))
+        results += [
+            (ndframe, func, expected)
+            for func, name in cython_table
+            if name == func_name
+        ]
+    return results

pandas/conftest.py

@@ -1119,10 +1119,7 @@ def spmatrix(request):
     return getattr(sparse, request.param + "_matrix")
 
 
-_cython_table = pd.core.base.SelectionMixin._cython_table.items()
-
-
-@pytest.fixture(params=list(_cython_table))
+@pytest.fixture(params=list(tm.cython_table))
 def cython_table_items(request):
     """
     Yields a tuple of a function and its corresponding name. Correspond to
@@ -1131,34 +1128,6 @@ def cython_table_items(request):
     return request.param
 
 
-def _get_cython_table_params(ndframe, func_names_and_expected):
-    """
-    Combine frame, functions from SelectionMixin._cython_table
-    keys and expected result.
-
-    Parameters
-    ----------
-    ndframe : DataFrame or Series
-    func_names_and_expected : Sequence of two items
-        The first item is a name of a NDFrame method ('sum', 'prod') etc.
-        The second item is the expected return value.
-
-    Returns
-    -------
-    list
-        List of three items (DataFrame, function, expected result)
-    """
-    results = []
-    for func_name, expected in func_names_and_expected:
-        results.append((ndframe, func_name, expected))
-        results += [
-            (ndframe, func, expected)
-            for func, name in _cython_table
-            if name == func_name
-        ]
-    return results
-
-
 @pytest.fixture(
     params=[
         getattr(pd.offsets, o)

pandas/tests/frame/test_apply.py

@@ -12,7 +12,6 @@
 import pandas as pd
 from pandas import DataFrame, MultiIndex, Series, Timestamp, date_range, notna
 import pandas._testing as tm
-from pandas.conftest import _get_cython_table_params
 from pandas.core.apply import frame_apply
 from pandas.core.base import SpecificationError
 
@@ -1323,7 +1322,7 @@ def func(group_col):
     @pytest.mark.parametrize(
         "df, func, expected",
         chain(
-            _get_cython_table_params(
+            tm.get_cython_table_params(
                 DataFrame(),
                 [
                     ("sum", Series(dtype="float64")),
@@ -1338,7 +1337,7 @@ def func(group_col):
                     ("median", Series(dtype="float64")),
                 ],
             ),
-            _get_cython_table_params(
+            tm.get_cython_table_params(
                 DataFrame([[np.nan, 1], [1, 2]]),
                 [
                     ("sum", Series([1.0, 3])),
@@ -1365,10 +1364,10 @@ def test_agg_cython_table(self, df, func, expected, axis):
     @pytest.mark.parametrize(
         "df, func, expected",
         chain(
-            _get_cython_table_params(
+            tm.get_cython_table_params(
                 DataFrame(), [("cumprod", DataFrame()), ("cumsum", DataFrame())]
             ),
-            _get_cython_table_params(
+            tm.get_cython_table_params(
                 DataFrame([[np.nan, 1], [1, 2]]),
                 [
                     ("cumprod", DataFrame([[np.nan, 1], [1, 2]])),
@@ -1390,7 +1389,7 @@ def test_agg_cython_table_transform(self, df, func, expected, axis):
 
     @pytest.mark.parametrize(
         "df, func, expected",
-        _get_cython_table_params(
+        tm.get_cython_table_params(
             DataFrame([["a", "b"], ["b", "a"]]), [["cumprod", TypeError]]
         ),
     )

pandas/tests/series/test_apply.py

@@ -9,7 +9,6 @@
 import pandas as pd
 from pandas import DataFrame, Index, Series, isna
 import pandas._testing as tm
-from pandas.conftest import _get_cython_table_params
 from pandas.core.base import SpecificationError
 
 
@@ -356,7 +355,7 @@ def test_non_callable_aggregates(self):
     @pytest.mark.parametrize(
         "series, func, expected",
         chain(
-            _get_cython_table_params(
+            tm.get_cython_table_params(
                 Series(dtype=np.float64),
                 [
                     ("sum", 0),
@@ -371,7 +370,7 @@ def test_non_callable_aggregates(self):
                     ("median", np.nan),
                 ],
             ),
-            _get_cython_table_params(
+            tm.get_cython_table_params(
                 Series([np.nan, 1, 2, 3]),
                 [
                     ("sum", 6),
@@ -386,7 +385,7 @@ def test_non_callable_aggregates(self):
                     ("median", 2),
                 ],
             ),
-            _get_cython_table_params(
+            tm.get_cython_table_params(
                 Series("a b c".split()),
                 [
                     ("sum", "abc"),
@@ -411,21 +410,21 @@ def test_agg_cython_table(self, series, func, expected):
     @pytest.mark.parametrize(
         "series, func, expected",
         chain(
-            _get_cython_table_params(
+            tm.get_cython_table_params(
                 Series(dtype=np.float64),
                 [
                     ("cumprod", Series([], Index([]), dtype=np.float64)),
                     ("cumsum", Series([], Index([]), dtype=np.float64)),
                 ],
             ),
-            _get_cython_table_params(
+            tm.get_cython_table_params(
                 Series([np.nan, 1, 2, 3]),
                 [
                     ("cumprod", Series([np.nan, 1, 2, 6])),
                     ("cumsum", Series([np.nan, 1, 3, 6])),
                 ],
             ),
-            _get_cython_table_params(
+            tm.get_cython_table_params(
                 Series("a b c".split()), [("cumsum", Series(["a", "ab", "abc"]))]
             ),
         ),
@@ -440,7 +439,7 @@ def test_agg_cython_table_transform(self, series, func, expected):
     @pytest.mark.parametrize(
         "series, func, expected",
         chain(
-            _get_cython_table_params(
+            tm.get_cython_table_params(
                 Series("a b c".split()),
                 [
                     ("mean", TypeError),  # mean raises TypeError