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Pre-import numpy lazy submodules before running tests #90

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Merged
SwayamInSync merged 2 commits into from
May 13, 2026
+15 −0
Merged

Pre-import numpy lazy submodules before running tests #90

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9ba366a
Pre-import numpy lazy submodules in tests/conftest.py
SwayamInSync May 12, 2026
ae21f08
Document workaround for numpy lazy loading issue
SwayamInSync May 13, 2026
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15 changes: 15 additions & 0 deletions tests/conftest.py
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Original file line number Diff line number Diff line change
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# Pre-import numpy's lazy submodules in single-threaded context before
# pytest-run-parallel forks workers. Works around CPython issue https://github.com/python/cpython/issues/149728
# which causes numpy's lazy __getattr__ on rec/ma/linalg/fft/... to recurse
# to RecursionError under concurrent first-touch from multiple threads.
# Drop this file when CPython bugfix release happens.

import numpy

for _attr in (
"linalg", "fft", "dtypes", "random", "polynomial", "ma",
"ctypeslib", "exceptions", "testing", "matlib", "f2py",
"typing", "rec", "char", "core", "strings",
):
getattr(numpy, _attr)
del _attr
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