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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ"""Unit tests for the memoryview Some tests are in test_bytes. Many tests that require _testbuffer.ndarray are in test_buffer. """ import unittest import test.support import sys import gc import weakref import array import io import copy import pickle class AbstractMemoryTests: source_bytes = b"abcdef" @property def _source(self): return self.source_bytes @property def _types(self): return filter(None, [self.ro_type, self.rw_type]) def check_getitem_with_type(self, tp): b = tp(self._source) oldrefcount = sys.getrefcount(b) m = self._view(b) self.assertEqual(m[0], ord(b"a")) self.assertIsInstance(m[0], int) self.assertEqual(m[5], ord(b"f")) self.assertEqual(m[-1], ord(b"f")) self.assertEqual(m[-6], ord(b"a")) # Bounds checking self.assertRaises(IndexError, lambda: m[6]) self.assertRaises(IndexError, lambda: m[-7]) self.assertRaises(IndexError, lambda: m[sys.maxsize]) self.assertRaises(IndexError, lambda: m[-sys.maxsize]) # Type checking self.assertRaises(TypeError, lambda: m[None]) self.assertRaises(TypeError, lambda: m[0.0]) self.assertRaises(TypeError, lambda: m["a"]) m = None self.assertEqual(sys.getrefcount(b), oldrefcount) def test_getitem(self): for tp in self._types: self.check_getitem_with_type(tp) def test_iter(self): for tp in self._types: b = tp(self._source) m = self._view(b) self.assertEqual(list(m), [m[i] for i in range(len(m))]) def test_setitem_readonly(self): if not self.ro_type: self.skipTest("no read-only type to test") b = self.ro_type(self._source) oldrefcount = sys.getrefcount(b) m = self._view(b) def setitem(value): m[0] = value self.assertRaises(TypeError, setitem, b"a") self.assertRaises(TypeError, setitem, 65) self.assertRaises(TypeError, setitem, memoryview(b"a")) m = None self.assertEqual(sys.getrefcount(b), oldrefcount) def test_setitem_writable(self): if not self.rw_type: self.skipTest("no writable type to test") tp = self.rw_type b = self.rw_type(self._source) oldrefcount = sys.getrefcount(b) m = self._view(b) m[0] = ord(b'1') self._check_contents(tp, b, b"1bcdef") m[0:1] = tp(b"0") self._check_contents(tp, b, b"0bcdef") m[1:3] = tp(b"12") self._check_contents(tp, b, b"012def") m[1:1] = tp(b"") self._check_contents(tp, b, b"012def") m[:] = tp(b"abcdef") self._check_contents(tp, b, b"abcdef") # Overlapping copies of a view into itself m[0:3] = m[2:5] self._check_contents(tp, b, b"cdedef") m[:] = tp(b"abcdef") m[2:5] = m[0:3] self._check_contents(tp, b, b"ababcf") def setitem(key, value): m[key] = tp(value) # Bounds checking self.assertRaises(IndexError, setitem, 6, b"a") self.assertRaises(IndexError, setitem, -7, b"a") self.assertRaises(IndexError, setitem, sys.maxsize, b"a") self.assertRaises(IndexError, setitem, -sys.maxsize, b"a") # Wrong index/slice types self.assertRaises(TypeError, setitem, 0.0, b"a") self.assertRaises(TypeError, setitem, (0,), b"a") self.assertRaises(TypeError, setitem, (slice(0,1,1), 0), b"a") self.assertRaises(TypeError, setitem, (0, slice(0,1,1)), b"a") self.assertRaises(TypeError, setitem, (0,), b"a") self.assertRaises(TypeError, setitem, "a", b"a") # Not implemented: multidimensional slices slices = (slice(0,1,1), slice(0,1,2)) self.assertRaises(NotImplementedError, setitem, slices, b"a") # Trying to resize the memory object exc = ValueError if m.format == 'c' else TypeError self.assertRaises(exc, setitem, 0, b"") self.assertRaises(exc, setitem, 0, b"ab") self.assertRaises(ValueError, setitem, slice(1,1), b"a") self.assertRaises(ValueError, setitem, slice(0,2), b"a") m = None self.assertEqual(sys.getrefcount(b), oldrefcount) def test_delitem(self): for tp in self._types: b = tp(self._source) m = self._view(b) with self.assertRaises(TypeError): del m[1] with self.assertRaises(TypeError): del m[1:4] def test_tobytes(self): for tp in self._types: m = self._view(tp(self._source)) b = m.tobytes() # This calls self.getitem_type() on each separate byte of b"abcdef" expected = b"".join( self.getitem_type(bytes([c])) for c in b"abcdef") self.assertEqual(b, expected) self.assertIsInstance(b, bytes) def test_tolist(self): for tp in self._types: m = self._view(tp(self._source)) l = m.tolist() self.assertEqual(l, list(b"abcdef")) def test_compare(self): # memoryviews can compare for equality with other objects # having the buffer interface. for tp in self._types: m = self._view(tp(self._source)) for tp_comp in self._types: self.assertTrue(m == tp_comp(b"abcdef")) self.assertFalse(m != tp_comp(b"abcdef")) self.assertFalse(m == tp_comp(b"abcde")) self.assertTrue(m != tp_comp(b"abcde")) self.assertFalse(m == tp_comp(b"abcde1")) self.assertTrue(m != tp_comp(b"abcde1")) self.assertTrue(m == m) self.assertTrue(m == m[:]) self.assertTrue(m[0:6] == m[:]) self.assertFalse(m[0:5] == m) # Comparison with objects which don't support the buffer API self.assertFalse(m == "abcdef") self.assertTrue(m != "abcdef") self.assertFalse("abcdef" == m) self.assertTrue("abcdef" != m) # Unordered comparisons for c in (m, b"abcdef"): self.assertRaises(TypeError, lambda: m < c) self.assertRaises(TypeError, lambda: c <= m) self.assertRaises(TypeError, lambda: m >= c) self.assertRaises(TypeError, lambda: c > m) def check_attributes_with_type(self, tp): m = self._view(tp(self._source)) self.assertEqual(m.format, self.format) self.assertEqual(m.itemsize, self.itemsize) self.assertEqual(m.ndim, 1) self.assertEqual(m.shape, (6,)) self.assertEqual(len(m), 6) self.assertEqual(m.strides, (self.itemsize,)) self.assertEqual(m.suboffsets, ()) return m def test_attributes_readonly(self): if not self.ro_type: self.skipTest("no read-only type to test") m = self.check_attributes_with_type(self.ro_type) self.assertEqual(m.readonly, True) def test_attributes_writable(self): if not self.rw_type: self.skipTest("no writable type to test") m = self.check_attributes_with_type(self.rw_type) self.assertEqual(m.readonly, False) def test_getbuffer(self): # Test PyObject_GetBuffer() on a memoryview object. for tp in self._types: b = tp(self._source) oldrefcount = sys.getrefcount(b) m = self._view(b) oldviewrefcount = sys.getrefcount(m) s = str(m, "utf-8") self._check_contents(tp, b, s.encode("utf-8")) self.assertEqual(sys.getrefcount(m), oldviewrefcount) m = None self.assertEqual(sys.getrefcount(b), oldrefcount) def test_gc(self): for tp in self._types: if not isinstance(tp, type): # If tp is a factory rather than a plain type, skip continue class MyView(): def __init__(self, base): self.m = memoryview(base) class MySource(tp): pass class MyObject: pass # Create a reference cycle through a memoryview object. # This exercises mbuf_clear(). b = MySource(tp(b'abc')) m = self._view(b) o = MyObject() b.m = m b.o = o wr = weakref.ref(o) b = m = o = None # The cycle must be broken gc.collect() self.assertTrue(wr() is None, wr()) # This exercises memory_clear(). m = MyView(tp(b'abc')) o = MyObject() m.x = m m.o = o wr = weakref.ref(o) m = o = None # The cycle must be broken gc.collect() self.assertTrue(wr() is None, wr()) def _check_released(self, m, tp): check = self.assertRaisesRegex(ValueError, "released") with check: bytes(m) with check: m.tobytes() with check: m.tolist() with check: m[0] with check: m[0] = b'x' with check: len(m) with check: m.format with check: m.itemsize with check: m.ndim with check: m.readonly with check: m.shape with check: m.strides with check: with m: pass # str() and repr() still function self.assertIn("released memory", str(m)) self.assertIn("released memory", repr(m)) self.assertEqual(m, m) self.assertNotEqual(m, memoryview(tp(self._source))) self.assertNotEqual(m, tp(self._source)) def test_contextmanager(self): for tp in self._types: b = tp(self._source) m = self._view(b) with m as cm: self.assertIs(cm, m) self._check_released(m, tp) m = self._view(b) # Can release explicitly inside the context manager with m: m.release() def test_release(self): for tp in self._types: b = tp(self._source) m = self._view(b) m.release() self._check_released(m, tp) # Can be called a second time (it's a no-op) m.release() self._check_released(m, tp) def test_writable_readonly(self): # Issue #10451: memoryview incorrectly exposes a readonly # buffer as writable causing a segfault if using mmap tp = self.ro_type if tp is None: self.skipTest("no read-only type to test") b = tp(self._source) m = self._view(b) i = io.BytesIO(b'ZZZZ') self.assertRaises(TypeError, i.readinto, m) def test_getbuf_fail(self): self.assertRaises(TypeError, self._view, {}) def test_hash(self): # Memoryviews of readonly (hashable) types are hashable, and they # hash as hash(obj.tobytes()). tp = self.ro_type if tp is None: self.skipTest("no read-only type to test") b = tp(self._source) m = self._view(b) self.assertEqual(hash(m), hash(b"abcdef")) # Releasing the memoryview keeps the stored hash value (as with weakrefs) m.release() self.assertEqual(hash(m), hash(b"abcdef")) # Hashing a memoryview for the first time after it is released # results in an error (as with weakrefs). m = self._view(b) m.release() self.assertRaises(ValueError, hash, m) def test_hash_writable(self): # Memoryviews of writable types are unhashable tp = self.rw_type if tp is None: self.skipTest("no writable type to test") b = tp(self._source) m = self._view(b) self.assertRaises(ValueError, hash, m) def test_weakref(self): # Check memoryviews are weakrefable for tp in self._types: b = tp(self._source) m = self._view(b) L = [] def callback(wr, b=b): L.append(b) wr = weakref.ref(m, callback) self.assertIs(wr(), m) del m test.support.gc_collect() self.assertIs(wr(), None) self.assertIs(L[0], b) def test_reversed(self): for tp in self._types: b = tp(self._source) m = self._view(b) aslist = list(reversed(m.tolist())) self.assertEqual(list(reversed(m)), aslist) self.assertEqual(list(reversed(m)), list(m[::-1])) def test_toreadonly(self): for tp in self._types: b = tp(self._source) m = self._view(b) mm = m.toreadonly() self.assertTrue(mm.readonly) self.assertTrue(memoryview(mm).readonly) self.assertEqual(mm.tolist(), m.tolist()) mm.release() m.tolist() def test_issue22668(self): a = array.array('H', [256, 256, 256, 256]) x = memoryview(a) m = x.cast('B') b = m.cast('H') c = b[0:2] d = memoryview(b) del b self.assertEqual(c[0], 256) self.assertEqual(d[0], 256) self.assertEqual(c.format, "H") self.assertEqual(d.format, "H") _ = m.cast('I') self.assertEqual(c[0], 256) self.assertEqual(d[0], 256) self.assertEqual(c.format, "H") self.assertEqual(d.format, "H") # Variations on source objects for the buffer: bytes-like objects, then arrays # with itemsize > 1. # NOTE: support for multi-dimensional objects is unimplemented. class BaseBytesMemoryTests(AbstractMemoryTests): ro_type = bytes rw_type = bytearray getitem_type = bytes itemsize = 1 format = 'B' class BaseArrayMemoryTests(AbstractMemoryTests): ro_type = None rw_type = lambda self, b: array.array('i', list(b)) getitem_type = lambda self, b: array.array('i', list(b)).tobytes() itemsize = array.array('i').itemsize format = 'i' @unittest.skip('XXX test should be adapted for non-byte buffers') def test_getbuffer(self): pass @unittest.skip('XXX NotImplementedError: tolist() only supports byte views') def test_tolist(self): pass # Variations on indirection levels: memoryview, slice of memoryview, # slice of slice of memoryview. # This is important to test allocation subtleties. class BaseMemoryviewTests: def _view(self, obj): return memoryview(obj) def _check_contents(self, tp, obj, contents): self.assertEqual(obj, tp(contents)) class BaseMemorySliceTests: source_bytes = b"XabcdefY" def _view(self, obj): m = memoryview(obj) return m[1:7] def _check_contents(self, tp, obj, contents): self.assertEqual(obj[1:7], tp(contents)) def test_refs(self): for tp in self._types: m = memoryview(tp(self._source)) oldrefcount = sys.getrefcount(m) m[1:2] self.assertEqual(sys.getrefcount(m), oldrefcount) class BaseMemorySliceSliceTests: source_bytes = b"XabcdefY" def _view(self, obj): m = memoryview(obj) return m[:7][1:] def _check_contents(self, tp, obj, contents): self.assertEqual(obj[1:7], tp(contents)) # Concrete test classes class BytesMemoryviewTest(unittest.TestCase, BaseMemoryviewTests, BaseBytesMemoryTests): def test_constructor(self): for tp in self._types: ob = tp(self._source) self.assertTrue(memoryview(ob)) self.assertTrue(memoryview(object=ob)) self.assertRaises(TypeError, memoryview) self.assertRaises(TypeError, memoryview, ob, ob) self.assertRaises(TypeError, memoryview, argument=ob) self.assertRaises(TypeError, memoryview, ob, argument=True) class ArrayMemoryviewTest(unittest.TestCase, BaseMemoryviewTests, BaseArrayMemoryTests): def test_array_assign(self): # Issue #4569: segfault when mutating a memoryview with itemsize != 1 a = array.array('i', range(10)) m = memoryview(a) new_a = array.array('i', range(9, -1, -1)) m[:] = new_a self.assertEqual(a, new_a) class BytesMemorySliceTest(unittest.TestCase, BaseMemorySliceTests, BaseBytesMemoryTests): pass class ArrayMemorySliceTest(unittest.TestCase, BaseMemorySliceTests, BaseArrayMemoryTests): pass class BytesMemorySliceSliceTest(unittest.TestCase, BaseMemorySliceSliceTests, BaseBytesMemoryTests): pass class ArrayMemorySliceSliceTest(unittest.TestCase, BaseMemorySliceSliceTests, BaseArrayMemoryTests): pass class OtherTest(unittest.TestCase): def test_ctypes_cast(self): # Issue 15944: Allow all source formats when casting to bytes. ctypes = test.support.import_module("ctypes") p6 = bytes(ctypes.c_double(0.6)) d = ctypes.c_double() m = memoryview(d).cast("B") m[:2] = p6[:2] m[2:] = p6[2:] self.assertEqual(d.value, 0.6) for format in "Bbc": with self.subTest(format): d = ctypes.c_double() m = memoryview(d).cast(format) m[:2] = memoryview(p6).cast(format)[:2] m[2:] = memoryview(p6).cast(format)[2:] self.assertEqual(d.value, 0.6) def test_memoryview_hex(self): # Issue #9951: memoryview.hex() segfaults with non-contiguous buffers. x = b'0' * 200000 m1 = memoryview(x) m2 = m1[::-1] self.assertEqual(m2.hex(), '30' * 200000) def test_copy(self): m = memoryview(b'abc') with self.assertRaises(TypeError): copy.copy(m) def test_pickle(self): m = memoryview(b'abc') for proto in range(pickle.HIGHEST_PROTOCOL + 1): with self.assertRaises(TypeError): pickle.dumps(m, proto) if __name__ == "__main__": unittest.main()