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BUG: fix infinite recursion in np.ma.flatten_structured_array (#30855) #30921

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Merged
charris merged 1 commit into from
Mar 4, 2026
+8 −1
Merged

BUG: fix infinite recursion in np.ma.flatten_structured_array (#30855) #30921

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2 changes: 1 addition & 1 deletion numpy/ma/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2579,7 +2579,7 @@ def flatten_sequence(iterable):

"""
for elm in iter(iterable):
if hasattr(elm, '__iter__'):
if hasattr(elm, "__iter__") and not isinstance(elm, (str, bytes)):
yield from flatten_sequence(elm)
else:
yield elm
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7 changes: 7 additions & 0 deletions numpy/ma/tests/test_core.py
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Expand Up @@ -997,6 +997,13 @@ def test_flatten_structured_array(self):
control = np.array([[[1., 1.], ], [[2., 2.], ]], dtype=float)
assert_equal(test, control)
assert_equal(test.dtype, control.dtype)
# for strings
ndtype = [('a', 'U5'), ('b', [('c', 'U5')])]
arr = np.array([('NumPy', ('array',)), ('array', ('numpy',))], dtype=ndtype)
test = flatten_structured_array(arr)
control = np.array([['NumPy', 'array'], ['array', 'numpy']], dtype='U5')
assert_equal(test, control)
assert_equal(test.dtype, control.dtype)

def test_void0d(self):
# Test creating a mvoid object
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