diff --git a/numpy/_core/tests/test_deprecations.py b/numpy/_core/tests/test_deprecations.py
index b83a2ac610ee..d4f2e9984266 100644
--- a/numpy/_core/tests/test_deprecations.py
+++ b/numpy/_core/tests/test_deprecations.py
@@ -448,6 +448,13 @@ def test_deprecated(self):
class TestAddNewdocUFunc(_DeprecationTestCase):
# Deprecated in Numpy 2.2, 2024-11
def test_deprecated(self):
+ doc = struct_ufunc.add_triplet.__doc__
+ # gh-26718
+ # This test mutates the C-level docstring pointer for add_triplet,
+ # which is permanent once set. Skip when re-running tests.
+ if doc is not None and "new docs" in doc:
+ pytest.skip("Cannot retest deprecation, otherwise ValueError: "
+ "Cannot change docstring of ufunc with non-NULL docstring")
self.assert_deprecated(
lambda: np._core.umath._add_newdoc_ufunc(
struct_ufunc.add_triplet, "new docs"
diff --git a/numpy/f2py/f2py2e.py b/numpy/f2py/f2py2e.py
index 459299f8e127..84a5aa3c20a6 100644
--- a/numpy/f2py/f2py2e.py
+++ b/numpy/f2py/f2py2e.py
@@ -378,6 +378,8 @@ def callcrackfortran(files, options):
mod['gil_used'] = 'Py_MOD_GIL_USED'
else:
mod['gil_used'] = 'Py_MOD_GIL_NOT_USED'
+ # gh-26718 Reset global
+ crackfortran.f77modulename = ''
return postlist
diff --git a/numpy/f2py/tests/test_docs.py b/numpy/f2py/tests/test_docs.py
index 5d9aaac9f15b..7015af3b2627 100644
--- a/numpy/f2py/tests/test_docs.py
+++ b/numpy/f2py/tests/test_docs.py
@@ -60,5 +60,7 @@ def test_ftype(self):
ftype.data.x[1] = 45
assert_array_equal(ftype.data.x,
np.array([1, 45, 3], dtype=np.float32))
+ # gh-26718 Cleanup for repeated test runs
+ ftype.data.a = 0
# TODO: implement test methods for other example Fortran codes
diff --git a/numpy/lib/tests/test_io.py b/numpy/lib/tests/test_io.py
index a1698f240bff..b8c8e6cfcac1 100644
--- a/numpy/lib/tests/test_io.py
+++ b/numpy/lib/tests/test_io.py
@@ -1276,12 +1276,16 @@ def test_max_rows_larger(self):
(1, ["ignored\n", "1,2\n", "\n", "3,4\n"]),
# "Bad" lines that do not end in newlines:
(1, ["ignored", "1,2", "", "3,4"]),
- (1, StringIO("ignored\n1,2\n\n3,4")),
+ (1, lambda: StringIO("ignored\n1,2\n\n3,4")),
# Same as above, but do not skip any lines:
(0, ["-1,0\n", "1,2\n", "\n", "3,4\n"]),
(0, ["-1,0", "1,2", "", "3,4"]),
- (0, StringIO("-1,0\n1,2\n\n3,4"))])
+ (0, lambda: StringIO("-1,0\n1,2\n\n3,4"))])
def test_max_rows_empty_lines(self, skip, data):
+ # gh-26718 re-instantiate StringIO objects each time
+ if callable(data):
+ data = data()
+
with pytest.warns(UserWarning,
match=f"Input line 3.*max_rows={3 - skip}"):
res = np.loadtxt(data, dtype=int, skiprows=skip, delimiter=",",
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