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from tempfile import NamedTemporaryFile, mktemp import os import warnings from numpy import memmap from numpy import arange, allclose from numpy.testing import * class TestMemmap(TestCase): def setUp(self): self.tmpfp = NamedTemporaryFile(prefix='mmap') self.shape = (3,4) self.dtype = 'float32' self.data = arange(12, dtype=self.dtype) self.data.resize(self.shape) def tearDown(self): self.tmpfp.close() def test_roundtrip(self): # Write data to file fp = memmap(self.tmpfp, dtype=self.dtype, mode='w+', shape=self.shape) fp[:] = self.data[:] del fp # Test __del__ machinery, which handles cleanup # Read data back from file newfp = memmap(self.tmpfp, dtype=self.dtype, mode='r', shape=self.shape) assert allclose(self.data, newfp) assert_array_equal(self.data, newfp) def test_open_with_filename(self): tmpname = mktemp('','mmap') fp = memmap(tmpname, dtype=self.dtype, mode='w+', shape=self.shape) fp[:] = self.data[:] del fp os.unlink(tmpname) def test_flush(self): fp = memmap(self.tmpfp, dtype=self.dtype, mode='w+', shape=self.shape) fp[:] = self.data[:] fp.flush() warnings.simplefilter('ignore', DeprecationWarning) fp.sync() warnings.simplefilter('default', DeprecationWarning) def test_del(self): # Make sure a view does not delete the underlying mmap fp_base = memmap(self.tmpfp, dtype=self.dtype, mode='w+', shape=self.shape) fp_view = fp_base[:] class ViewCloseError(Exception): pass _close = memmap._close def replace_close(self): raise ViewCloseError('View should not call _close on memmap') try: memmap._close = replace_close del fp_view finally: memmap._close = _close if __name__ == "__main__": run_module_suite()