77 lines
2.6 KiB
Python
77 lines
2.6 KiB
Python
import pickle
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import subprocess
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import sys
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import textwrap
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from importlib import reload
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import pytest
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import numpy.exceptions as ex
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from numpy.testing import IS_WASM, assert_, assert_equal, assert_raises
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@pytest.mark.thread_unsafe(reason="reloads global module")
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def test_numpy_reloading():
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# gh-7844. Also check that relevant globals retain their identity.
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import numpy as np
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import numpy._globals
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_NoValue = np._NoValue
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VisibleDeprecationWarning = ex.VisibleDeprecationWarning
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ModuleDeprecationWarning = ex.ModuleDeprecationWarning
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with pytest.warns(UserWarning):
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reload(np)
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assert_(_NoValue is np._NoValue)
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assert_(ModuleDeprecationWarning is ex.ModuleDeprecationWarning)
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assert_(VisibleDeprecationWarning is ex.VisibleDeprecationWarning)
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assert_raises(RuntimeError, reload, numpy._globals)
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with pytest.warns(UserWarning):
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reload(np)
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assert_(_NoValue is np._NoValue)
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assert_(ModuleDeprecationWarning is ex.ModuleDeprecationWarning)
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assert_(VisibleDeprecationWarning is ex.VisibleDeprecationWarning)
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def test_novalue():
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import numpy as np
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for proto in range(2, pickle.HIGHEST_PROTOCOL + 1):
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assert_equal(repr(np._NoValue), '<no value>')
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assert_(pickle.loads(pickle.dumps(np._NoValue,
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protocol=proto)) is np._NoValue)
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@pytest.mark.skipif(IS_WASM, reason="can't start subprocess")
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def test_full_reimport():
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# Reimporting numpy like this is not safe due to use of global C state,
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# and has unexpected side effects. Test that an ImportError is raised.
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# When all extension modules are isolated, this should test that clearing
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# sys.modules and reimporting numpy works without error.
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# Test within a new process, to ensure that we do not mess with the
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# global state during the test run (could lead to cryptic test failures).
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# This is generally unsafe, especially, since we also reload the C-modules.
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code = textwrap.dedent(r"""
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import sys
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import numpy as np
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for k in [k for k in sys.modules if k.startswith('numpy')]:
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del sys.modules[k]
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try:
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import numpy as np
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except ImportError as err:
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if str(err) != "cannot load module more than once per process":
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raise SystemExit(f"Unexpected ImportError: {err}")
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else:
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raise SystemExit("DID NOT RAISE ImportError")
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""")
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p = subprocess.run(
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(sys.executable, '-c', code),
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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encoding='utf-8',
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check=False,
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)
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assert p.returncode == 0, p.stdout
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