/usr/lib/python2.7/dist-packages/numpy/core/tests/test_memmap.py is in python-numpy 1:1.12.1-3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 | from __future__ import division, absolute_import, print_function
import sys
import os
import shutil
from tempfile import NamedTemporaryFile, TemporaryFile, mktemp, mkdtemp
from numpy import (
memmap, sum, average, product, ndarray, isscalar, add, subtract, multiply)
from numpy.compat import Path
from numpy import arange, allclose, asarray
from numpy.testing import (
TestCase, run_module_suite, assert_, assert_equal, assert_array_equal,
dec, suppress_warnings
)
class TestMemmap(TestCase):
def setUp(self):
self.tmpfp = NamedTemporaryFile(prefix='mmap')
self.tempdir = mkdtemp()
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()
shutil.rmtree(self.tempdir)
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', dir=self.tempdir)
fp = memmap(tmpname, dtype=self.dtype, mode='w+',
shape=self.shape)
fp[:] = self.data[:]
del fp
def test_unnamed_file(self):
with TemporaryFile() as f:
fp = memmap(f, dtype=self.dtype, shape=self.shape)
del fp
def test_attributes(self):
offset = 1
mode = "w+"
fp = memmap(self.tmpfp, dtype=self.dtype, mode=mode,
shape=self.shape, offset=offset)
self.assertEqual(offset, fp.offset)
self.assertEqual(mode, fp.mode)
del fp
def test_filename(self):
tmpname = mktemp('', 'mmap', dir=self.tempdir)
fp = memmap(tmpname, dtype=self.dtype, mode='w+',
shape=self.shape)
abspath = os.path.abspath(tmpname)
fp[:] = self.data[:]
self.assertEqual(abspath, fp.filename)
b = fp[:1]
self.assertEqual(abspath, b.filename)
del b
del fp
@dec.skipif(Path is None, "No pathlib.Path")
def test_path(self):
tmpname = mktemp('', 'mmap', dir=self.tempdir)
fp = memmap(Path(tmpname), dtype=self.dtype, mode='w+',
shape=self.shape)
abspath = os.path.realpath(os.path.abspath(tmpname))
fp[:] = self.data[:]
self.assertEqual(abspath, str(fp.filename.resolve()))
b = fp[:1]
self.assertEqual(abspath, str(b.filename.resolve()))
del b
del fp
def test_filename_fileobj(self):
fp = memmap(self.tmpfp, dtype=self.dtype, mode="w+",
shape=self.shape)
self.assertEqual(fp.filename, self.tmpfp.name)
@dec.knownfailureif(sys.platform == 'gnu0', "This test is known to fail on hurd")
def test_flush(self):
fp = memmap(self.tmpfp, dtype=self.dtype, mode='w+',
shape=self.shape)
fp[:] = self.data[:]
assert_equal(fp[0], self.data[0])
fp.flush()
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_base[0] = 5
fp_view = fp_base[0:1]
assert_equal(fp_view[0], 5)
del fp_view
# Should still be able to access and assign values after
# deleting the view
assert_equal(fp_base[0], 5)
fp_base[0] = 6
assert_equal(fp_base[0], 6)
def test_arithmetic_drops_references(self):
fp = memmap(self.tmpfp, dtype=self.dtype, mode='w+',
shape=self.shape)
tmp = (fp + 10)
if isinstance(tmp, memmap):
assert_(tmp._mmap is not fp._mmap)
def test_indexing_drops_references(self):
fp = memmap(self.tmpfp, dtype=self.dtype, mode='w+',
shape=self.shape)
tmp = fp[[(1, 2), (2, 3)]]
if isinstance(tmp, memmap):
assert_(tmp._mmap is not fp._mmap)
def test_slicing_keeps_references(self):
fp = memmap(self.tmpfp, dtype=self.dtype, mode='w+',
shape=self.shape)
assert_(fp[:2, :2]._mmap is fp._mmap)
def test_view(self):
fp = memmap(self.tmpfp, dtype=self.dtype, shape=self.shape)
new1 = fp.view()
new2 = new1.view()
assert_(new1.base is fp)
assert_(new2.base is fp)
new_array = asarray(fp)
assert_(new_array.base is fp)
def test_ufunc_return_ndarray(self):
fp = memmap(self.tmpfp, dtype=self.dtype, shape=self.shape)
fp[:] = self.data
with suppress_warnings() as sup:
sup.filter(FutureWarning, "np.average currently does not preserve")
for unary_op in [sum, average, product]:
result = unary_op(fp)
assert_(isscalar(result))
assert_(result.__class__ is self.data[0, 0].__class__)
assert_(unary_op(fp, axis=0).__class__ is ndarray)
assert_(unary_op(fp, axis=1).__class__ is ndarray)
for binary_op in [add, subtract, multiply]:
assert_(binary_op(fp, self.data).__class__ is ndarray)
assert_(binary_op(self.data, fp).__class__ is ndarray)
assert_(binary_op(fp, fp).__class__ is ndarray)
fp += 1
assert(fp.__class__ is memmap)
add(fp, 1, out=fp)
assert(fp.__class__ is memmap)
def test_getitem(self):
fp = memmap(self.tmpfp, dtype=self.dtype, shape=self.shape)
fp[:] = self.data
assert_(fp[1:, :-1].__class__ is memmap)
# Fancy indexing returns a copy that is not memmapped
assert_(fp[[0, 1]].__class__ is ndarray)
def test_memmap_subclass(self):
class MemmapSubClass(memmap):
pass
fp = MemmapSubClass(self.tmpfp, dtype=self.dtype, shape=self.shape)
fp[:] = self.data
# We keep previous behavior for subclasses of memmap, i.e. the
# ufunc and __getitem__ output is never turned into a ndarray
assert_(sum(fp, axis=0).__class__ is MemmapSubClass)
assert_(sum(fp).__class__ is MemmapSubClass)
assert_(fp[1:, :-1].__class__ is MemmapSubClass)
assert(fp[[0, 1]].__class__ is MemmapSubClass)
if __name__ == "__main__":
run_module_suite()
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