import sys
import importlib
from importlib.util import LazyLoader, find_spec, module_from_spec
import pytest
# Warning raised by _reload_guard() in numpy/__init__.py
@pytest.mark.filterwarnings("ignore:The NumPy module was reloaded")
def test_lazy_load():
# gh-22045. lazyload doesn't import submodule names into the namespace
# muck with sys.modules to test the importing system
old_numpy = sys.modules.pop("numpy")
numpy_modules = {}
for mod_name, mod in list(sys.modules.items()):
if mod_name[:6] == "numpy.":
numpy_modules[mod_name] = mod
sys.modules.pop(mod_name)
try:
# 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
# test triggering the import of the package
np.ndarray
finally:
if old_numpy:
sys.modules["numpy"] = old_numpy
sys.modules.update(numpy_modules)
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