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- import subprocess
- import sys
- import textwrap
- import pytest
- from numpy.testing import IS_WASM
- @pytest.mark.skipif(IS_WASM, reason="can't start subprocess")
- def test_lazy_load():
- # gh-22045. lazyload doesn't import submodule names into the namespace
- # Test within a new process, to ensure that we do not mess with the
- # global state during the test run (could lead to cryptic test failures).
- # This is generally unsafe, especially, since we also reload the C-modules.
- code = textwrap.dedent(r"""
- import sys
- from importlib.util import LazyLoader, find_spec, module_from_spec
- # create lazy load of numpy as np
- spec = find_spec("numpy")
- module = module_from_spec(spec)
- sys.modules["numpy"] = module
- loader = LazyLoader(spec.loader)
- loader.exec_module(module)
- np = module
- # test a subpackage import
- from numpy.lib import recfunctions # noqa: F401
- # test triggering the import of the package
- np.ndarray
- """)
- p = subprocess.run(
- (sys.executable, '-c', code),
- stdout=subprocess.PIPE,
- stderr=subprocess.STDOUT,
- encoding='utf-8',
- check=False,
- )
- assert p.returncode == 0, p.stdout
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