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BUG: fix deepcopying StringDType arrays #28643

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Merged
merged 1 commit into from
Apr 4, 2025
Merged

BUG: fix deepcopying StringDType arrays #28643

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2 changes: 1 addition & 1 deletion numpy/_core/src/multiarray/methods.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1581,7 +1581,7 @@ _deepcopy_call(char *iptr, char *optr, PyArray_Descr *dtype,
}
}
}
else {
else if (PyDataType_ISOBJECT(dtype)) {
PyObject *itemp, *otemp;
PyObject *res;
memcpy(&itemp, iptr, sizeof(itemp));
Expand Down
21 changes: 14 additions & 7 deletions numpy/_core/tests/test_stringdtype.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
import copy
import itertools
import os
import pickle
import string
import sys
import tempfile

Expand Down Expand Up @@ -371,6 +371,13 @@ def test_pickle(dtype, string_list):
os.remove(f.name)


def test_stdlib_copy(dtype, string_list):
arr = np.array(string_list, dtype=dtype)

assert_array_equal(copy.copy(arr), arr)
assert_array_equal(copy.deepcopy(arr), arr)


@pytest.mark.parametrize(
"strings",
[
Expand Down Expand Up @@ -1674,12 +1681,12 @@ def test_zeros(self):
assert_array_equal(z, "")

def test_copy(self):
c = self.a.copy()
assert_array_equal(self.get_flags(c), self.get_flags(self.a))
assert_array_equal(c, self.a)
offsets = self.get_view(c)['offset']
assert offsets[2] == 1
assert offsets[3] == 1 + len(self.s_medium) + self.sizeofstr // 2
for c in [self.a.copy(), copy.copy(self.a), copy.deepcopy(self.a)]:
assert_array_equal(self.get_flags(c), self.get_flags(self.a))
assert_array_equal(c, self.a)
offsets = self.get_view(c)['offset']
assert offsets[2] == 1
assert offsets[3] == 1 + len(self.s_medium) + self.sizeofstr // 2

def test_arena_use_with_setting(self):
c = np.zeros_like(self.a)
Expand Down
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