From 67231c457da56cb0028ea4d69ed0c1d3d9688199 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Mon, 5 Feb 2024 10:24:29 -0800
Subject: [PATCH 1/2] COMPAT: Numpy 2.0 casting compat

---
 pandas/core/dtypes/cast.py               |  1 +
 pandas/core/internals/blocks.py          |  9 ++++++++-
 pandas/tests/series/test_constructors.py | 12 +++++++++---
 3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/pandas/core/dtypes/cast.py b/pandas/core/dtypes/cast.py
index 4d76ce5799e7b..dfe12872c3916 100644
--- a/pandas/core/dtypes/cast.py
+++ b/pandas/core/dtypes/cast.py
@@ -1683,6 +1683,7 @@ def maybe_cast_to_integer_array(arr: list | np.ndarray, dtype: np.dtype) -> np.n
     arr = np.asarray(arr)
 
     if np.issubdtype(arr.dtype, str):
+        # TODO(numpy-2.0 min): This case will raise an OverflowError above
         if (casted.astype(str) == arr).all():
             return casted
         raise ValueError(f"string values cannot be losslessly cast to {dtype}")
diff --git a/pandas/core/internals/blocks.py b/pandas/core/internals/blocks.py
index 02296643acc3e..910de45d3e89f 100644
--- a/pandas/core/internals/blocks.py
+++ b/pandas/core/internals/blocks.py
@@ -1388,7 +1388,14 @@ def setitem(self, indexer, value) -> Block:
             if isinstance(casted, np.ndarray) and casted.ndim == 1 and len(casted) == 1:
                 # NumPy 1.25 deprecation: https://github.com/numpy/numpy/pull/10615
                 casted = casted[0, ...]
-            values[indexer] = casted
+            try:
+                values[indexer] = casted
+            except (TypeError, ValueError) as err:
+                if is_list_like(casted):
+                    raise ValueError(
+                        "setting an array element with a sequence."
+                    ) from err
+                raise
         return self
 
     def putmask(self, mask, new) -> list[Block]:
diff --git a/pandas/tests/series/test_constructors.py b/pandas/tests/series/test_constructors.py
index a1e08f484ebba..e17cf7491f58b 100644
--- a/pandas/tests/series/test_constructors.py
+++ b/pandas/tests/series/test_constructors.py
@@ -1949,9 +1949,15 @@ def test_constructor_int64_dtype(self, any_int_dtype):
 
     def test_constructor_raise_on_lossy_conversion_of_strings(self):
         # GH#44923
-        with pytest.raises(
-            ValueError, match="string values cannot be losslessly cast to int8"
-        ):
+        if not np_version_gt2:
+            raises = pytest.raises(
+                ValueError, match="string values cannot be losslessly cast to int8"
+            )
+        else:
+            raises = pytest.raises(
+                OverflowError, match="The elements provided in the data"
+            )
+        with raises:
             Series(["128"], dtype="int8")
 
     def test_constructor_dtype_timedelta_alternative_construct(self):

From 3afe80274bd8fe7420d85e4382ca0c47cf3b7da4 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Mon, 5 Feb 2024 13:33:56 -0800
Subject: [PATCH 2/2] Simplify other expected messages

---
 pandas/tests/indexing/test_loc.py | 16 ++--------------
 1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/pandas/tests/indexing/test_loc.py b/pandas/tests/indexing/test_loc.py
index 193c296115479..4f70c63aeb353 100644
--- a/pandas/tests/indexing/test_loc.py
+++ b/pandas/tests/indexing/test_loc.py
@@ -1224,13 +1224,7 @@ def test_loc_setitem_empty_append_raises(self):
         with pytest.raises(KeyError, match=msg):
             df.loc[[0, 1], "x"] = data
 
-        msg = "|".join(
-            [
-                "cannot copy sequence with size 2 to array axis with dimension 0",
-                r"could not broadcast input array from shape \(2,\) into shape \(0,\)",
-                "Must have equal len keys and value when setting with an iterable",
-            ]
-        )
+        msg = "setting an array element with a sequence."
         with pytest.raises(ValueError, match=msg):
             df.loc[0:2, "x"] = data
 
@@ -1556,16 +1550,10 @@ def test_loc_setitem_2d_to_1d_raises(self):
         # float64 dtype to avoid upcast when trying to set float data
         ser = Series(range(2), dtype="float64")
 
-        msg = "|".join(
-            [
-                r"shape mismatch: value array of shape \(2,2\)",
-                r"cannot reshape array of size 4 into shape \(2,\)",
-            ]
-        )
+        msg = "setting an array element with a sequence."
         with pytest.raises(ValueError, match=msg):
             ser.loc[range(2)] = data
 
-        msg = r"could not broadcast input array from shape \(2,2\) into shape \(2,?\)"
         with pytest.raises(ValueError, match=msg):
             ser.loc[:] = data