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asv_bench/benchmarks/arithmetic.py

@@ -50,6 +50,36 @@ def time_frame_op_with_scalar(self, dtype, scalar, op):
         op(self.df, scalar)
 
 
+class MixedFrameWithSeriesAxis0:
+    params = [
+        [
+            "eq",
+            "ne",
+            "lt",
+            "le",
+            "ge",
+            "gt",
+            "add",
+            "sub",
+            "div",
+            "floordiv",
+            "mul",
+            "pow",
+        ]
+    ]
+    param_names = ["opname"]
+
+    def setup(self, opname):
+        arr = np.arange(10 ** 6).reshape(100, -1)
+        df = DataFrame(arr)
+        df["C"] = 1.0
+        self.df = df
+        self.ser = df[0]
+
+    def time_frame_op_with_series_axis0(self, opname):
+        getattr(self.df, opname)(self.ser, axis=0)
+
+
 class Ops:
 
     params = [[True, False], ["default", 1]]

doc/source/whatsnew/v1.1.0.rst

@@ -67,6 +67,7 @@ Other enhancements
 - When writing directly to a sqlite connection :func:`to_sql` now supports the ``multi`` method (:issue:`29921`)
 - `OptionError` is now exposed in `pandas.errors` (:issue:`27553`)
 - :func:`timedelta_range` will now infer a frequency when passed ``start``, ``stop``, and ``periods`` (:issue:`32377`)
+- Positional slicing on a :class:`IntervalIndex` now supports slices with ``step > 1`` (:issue:`31658`)
 -
 
 .. ---------------------------------------------------------------------------
@@ -172,7 +173,7 @@ Deprecations
 ~~~~~~~~~~~~
 - Lookups on a :class:`Series` with a single-item list containing a slice (e.g. ``ser[[slice(0, 4)]]``) are deprecated, will raise in a future version.  Either convert the list to tuple, or pass the slice directly instead (:issue:`31333`)
 - :meth:`DataFrame.mean` and :meth:`DataFrame.median` with ``numeric_only=None`` will include datetime64 and datetime64tz columns in a future version (:issue:`29941`)
--
+- Setting values with ``.loc`` using a positional slice is deprecated and will raise in a future version.  Use ``.loc`` with labels or ``.iloc`` with positions instead (:issue:`31840`)
 -
 
 .. ---------------------------------------------------------------------------
@@ -185,7 +186,7 @@ Performance improvements
 
 - Performance improvement in :class:`Timedelta` constructor (:issue:`30543`)
 - Performance improvement in :class:`Timestamp` constructor (:issue:`30543`)
--
+- Performance improvement in flex arithmetic ops between :class:`DataFrame` and :class:`Series` with ``axis=0`` (:issue:`31296`)
 -
 
 .. ---------------------------------------------------------------------------
@@ -248,7 +249,6 @@ Strings
 
 Interval
 ^^^^^^^^
-
 -
 -
 

pandas/_libs/ops.pyx

@@ -100,7 +100,7 @@ def scalar_compare(object[:] values, object val, object op):
 
 @cython.wraparound(False)
 @cython.boundscheck(False)
-def vec_compare(object[:] left, object[:] right, object op):
+def vec_compare(ndarray[object] left, ndarray[object] right, object op):
     """
     Compare the elements of `left` with the elements of `right` pointwise,
     with the comparison operation described by `op`.

pandas/_testing.py

@@ -34,6 +34,7 @@
     is_interval_dtype,
     is_list_like,
     is_number,
+    is_numeric_dtype,
     is_period_dtype,
     is_sequence,
     is_timedelta64_dtype,
@@ -1064,7 +1065,6 @@ def assert_series_equal(
     right,
     check_dtype=True,
     check_index_type="equiv",
-    check_series_type=True,
     check_less_precise=False,
     check_names=True,
     check_exact=False,
@@ -1085,8 +1085,6 @@ def assert_series_equal(
     check_index_type : bool or {'equiv'}, default 'equiv'
         Whether to check the Index class, dtype and inferred_type
         are identical.
-    check_series_type : bool, default True
-        Whether to check the Series class is identical.
     check_less_precise : bool or int, default False
         Specify comparison precision. Only used when check_exact is False.
         5 digits (False) or 3 digits (True) after decimal points are compared.
@@ -1118,11 +1116,10 @@ def assert_series_equal(
     # instance validation
     _check_isinstance(left, right, Series)
 
-    if check_series_type:
-        # ToDo: There are some tests using rhs is sparse
-        # lhs is dense. Should use assert_class_equal in future
-        assert isinstance(left, type(right))
-        # assert_class_equal(left, right, obj=obj)
+    # TODO: There are some tests using rhs is sparse
+    # lhs is dense. Should use assert_class_equal in future
+    assert isinstance(left, type(right))
+    # assert_class_equal(left, right, obj=obj)
 
     # length comparison
     if len(left) != len(right):
@@ -1147,47 +1144,40 @@ def assert_series_equal(
         # is False. We'll still raise if only one is a `Categorical`,
         # regardless of `check_categorical`
         if (
-            is_categorical_dtype(left)
-            and is_categorical_dtype(right)
+            is_categorical_dtype(left.dtype)
+            and is_categorical_dtype(right.dtype)
             and not check_categorical
         ):
             pass
         else:
             assert_attr_equal("dtype", left, right, obj=f"Attributes of {obj}")
 
     if check_exact:
+        if not is_numeric_dtype(left.dtype):
+            raise AssertionError("check_exact may only be used with numeric Series")
+
         assert_numpy_array_equal(
-            left._internal_get_values(),
-            right._internal_get_values(),
-            check_dtype=check_dtype,
-            obj=str(obj),
+            left._values, right._values, check_dtype=check_dtype, obj=str(obj)
         )
-    elif check_datetimelike_compat:
+    elif check_datetimelike_compat and (
+        needs_i8_conversion(left.dtype) or needs_i8_conversion(right.dtype)
+    ):
         # we want to check only if we have compat dtypes
         # e.g. integer and M|m are NOT compat, but we can simply check
         # the values in that case
-        if needs_i8_conversion(left) or needs_i8_conversion(right):
-
-            # datetimelike may have different objects (e.g. datetime.datetime
-            # vs Timestamp) but will compare equal
-            if not Index(left._values).equals(Index(right._values)):
-                msg = (
-                    f"[datetimelike_compat=True] {left._values} "
-                    f"is not equal to {right._values}."
-                )
-                raise AssertionError(msg)
-        else:
-            assert_numpy_array_equal(
-                left._internal_get_values(),
-                right._internal_get_values(),
-                check_dtype=check_dtype,
+
+        # datetimelike may have different objects (e.g. datetime.datetime
+        # vs Timestamp) but will compare equal
+        if not Index(left._values).equals(Index(right._values)):
+            msg = (
+                f"[datetimelike_compat=True] {left._values} "
+                f"is not equal to {right._values}."
             )
-    elif is_interval_dtype(left) or is_interval_dtype(right):
+            raise AssertionError(msg)
+    elif is_interval_dtype(left.dtype) or is_interval_dtype(right.dtype):
         assert_interval_array_equal(left.array, right.array)
-    elif is_extension_array_dtype(left.dtype) and is_datetime64tz_dtype(left.dtype):
+    elif is_datetime64tz_dtype(left.dtype):
         # .values is an ndarray, but ._values is the ExtensionArray.
-        # TODO: Use .array
-        assert is_extension_array_dtype(right.dtype)
         assert_extension_array_equal(left._values, right._values)
     elif (
         is_extension_array_dtype(left)

pandas/core/frame.py

@@ -5212,20 +5212,6 @@ def _arith_op(left, right):
 
         return new_data
 
-    def _combine_match_index(self, other: Series, func):
-        # at this point we have `self.index.equals(other.index)`
-
-        if ops.should_series_dispatch(self, other, func):
-            # operate column-wise; avoid costly object-casting in `.values`
-            new_data = ops.dispatch_to_series(self, other, func)
-        else:
-            # fastpath --> operate directly on values
-            other_vals = other.values.reshape(-1, 1)
-            with np.errstate(all="ignore"):
-                new_data = func(self.values, other_vals)
-            new_data = dispatch_fill_zeros(func, self.values, other_vals, new_data)
-        return new_data
-
     def _construct_result(self, result) -> "DataFrame":
         """
         Wrap the result of an arithmetic, comparison, or logical operation.

pandas/core/indexers.py

@@ -11,6 +11,7 @@
     is_array_like,
     is_bool_dtype,
     is_extension_array_dtype,
+    is_integer,
     is_integer_dtype,
     is_list_like,
 )
@@ -20,6 +21,34 @@
 # Indexer Identification
 
 
+def is_valid_positional_slice(slc: slice) -> bool:
+    """
+    Check if a slice object can be interpreted as a positional indexer.
+
+    Parameters
+    ----------
+    slc : slice
+
+    Returns
+    -------
+    bool
+
+    Notes
+    -----
+    A valid positional slice may also be interpreted as a label-based slice
+    depending on the index being sliced.
+    """
+
+    def is_int_or_none(val):
+        return val is None or is_integer(val)
+
+    return (
+        is_int_or_none(slc.start)
+        and is_int_or_none(slc.stop)
+        and is_int_or_none(slc.step)
+    )
+
+
 def is_list_like_indexer(key) -> bool:
     """
     Check if we have a list-like indexer that is *not* a NamedTuple.

pandas/core/indexes/base.py

@@ -3137,8 +3137,18 @@ def is_int(v):
                 pass
 
         if com.is_null_slice(key):
+            # It doesn't matter if we are positional or label based
             indexer = key
         elif is_positional:
+            if kind == "loc":
+                # GH#16121, GH#24612, GH#31810
+                warnings.warn(
+                    "Slicing a positional slice with .loc is not supported, "
+                    "and will raise TypeError in a future version.  "
+                    "Use .loc with labels or .iloc with positions instead.",
+                    FutureWarning,
+                    stacklevel=6,
+                )
             indexer = key
         else:
             indexer = self.slice_indexer(start, stop, step, kind=kind)

pandas/core/indexes/interval.py

@@ -39,6 +39,7 @@
 from pandas.core.algorithms import take_1d
 from pandas.core.arrays.interval import IntervalArray, _interval_shared_docs
 import pandas.core.common as com
+from pandas.core.indexers import is_valid_positional_slice
 import pandas.core.indexes.base as ibase
 from pandas.core.indexes.base import (
     Index,
@@ -866,7 +867,16 @@ def get_indexer_for(self, target: AnyArrayLike, **kwargs) -> np.ndarray:
 
     def _convert_slice_indexer(self, key: slice, kind: str):
         if not (key.step is None or key.step == 1):
-            raise ValueError("cannot support not-default step in a slice")
+            # GH#31658 if label-based, we require step == 1,
+            #  if positional, we disallow float start/stop
+            msg = "label-based slicing with step!=1 is not supported for IntervalIndex"
+            if kind == "loc":
+                raise ValueError(msg)
+            elif kind == "getitem":
+                if not is_valid_positional_slice(key):
+                    # i.e. this cannot be interpreted as a positional slice
+                    raise ValueError(msg)
+
         return super()._convert_slice_indexer(key, kind)
 
     @Appender(Index.where.__doc__)