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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()