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import sys import joblib from joblib.testing import check_subprocess_call from joblib.test.common import with_multiprocessing def test_version(): assert hasattr(joblib, '__version__'), ( "There are no __version__ argument on the joblib module") @with_multiprocessing def test_no_start_method_side_effect_on_import(): # check that importing joblib does not implicitly set the global # start_method for multiprocessing. code = """if True: import joblib import multiprocessing as mp # The following line would raise RuntimeError if the # start_method is already set. mp.set_start_method("loky") """ check_subprocess_call([sys.executable, '-c', code]) @with_multiprocessing def test_no_semaphore_tracker_on_import(): # check that importing joblib does not implicitly spawn a resource tracker # or a semaphore tracker code = """if True: import joblib from multiprocessing import semaphore_tracker # The following line would raise RuntimeError if the # start_method is already set. msg = "multiprocessing.semaphore_tracker has been spawned on import" assert semaphore_tracker._semaphore_tracker._fd is None, msg""" if sys.version_info >= (3, 8): # semaphore_tracker was renamed in Python 3.8: code = code.replace("semaphore_tracker", "resource_tracker") check_subprocess_call([sys.executable, '-c', code]) @with_multiprocessing def test_no_resource_tracker_on_import(): code = """if True: import joblib from joblib.externals.loky.backend import resource_tracker # The following line would raise RuntimeError if the # start_method is already set. msg = "loky.resource_tracker has been spawned on import" assert resource_tracker._resource_tracker._fd is None, msg """ check_subprocess_call([sys.executable, '-c', code])
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