def test_memoryview_tobytes(self):
# Many implicit tests are already in self.verify().
t = (-529, 576, -625, 676, -729)
nd = ndarray(t, shape=[5], format='@h')
m = memoryview(nd)
self.assertEqual(m, nd)
self.assertEqual(m.tobytes(), nd.tobytes())
nd = ndarray([t], shape=[1], format='>hQiLl')
m = memoryview(nd)
self.assertEqual(m, nd)
self.assertEqual(m.tobytes(), nd.tobytes())
nd = ndarray([t for _ in range(12)], shape=[2,2,3], format='=hQiLl')
m = memoryview(nd)
self.assertEqual(m, nd)
self.assertEqual(m.tobytes(), nd.tobytes())
nd = ndarray([t for _ in range(120)], shape=[5,2,2,3,2],
format='<hQiLl')
m = memoryview(nd)
self.assertEqual(m, nd)
self.assertEqual(m.tobytes(), nd.tobytes())
# Unknown formats are handled: tobytes() purely depends on itemsize.
if ctypes:
# format: "T{>l:x:>l:y:}"
class BEPoint(ctypes.BigEndianStructure):
_fields_ = [("x", ctypes.c_long), ("y", ctypes.c_long)]
point = BEPoint(100, 200)
a = memoryview(point)
self.assertEqual(a.tobytes(), bytes(point))
python类BigEndianStructure()的实例源码
def test_memoryview_tobytes(self):
# Many implicit tests are already in self.verify().
t = (-529, 576, -625, 676, -729)
nd = ndarray(t, shape=[5], format='@h')
m = memoryview(nd)
self.assertEqual(m, nd)
self.assertEqual(m.tobytes(), nd.tobytes())
nd = ndarray([t], shape=[1], format='>hQiLl')
m = memoryview(nd)
self.assertEqual(m, nd)
self.assertEqual(m.tobytes(), nd.tobytes())
nd = ndarray([t for _ in range(12)], shape=[2,2,3], format='=hQiLl')
m = memoryview(nd)
self.assertEqual(m, nd)
self.assertEqual(m.tobytes(), nd.tobytes())
nd = ndarray([t for _ in range(120)], shape=[5,2,2,3,2],
format='<hQiLl')
m = memoryview(nd)
self.assertEqual(m, nd)
self.assertEqual(m.tobytes(), nd.tobytes())
# Unknown formats are handled: tobytes() purely depends on itemsize.
if ctypes:
# format: "T{>l:x:>l:y:}"
class BEPoint(ctypes.BigEndianStructure):
_fields_ = [("x", ctypes.c_long), ("y", ctypes.c_long)]
point = BEPoint(100, 200)
a = memoryview(point)
self.assertEqual(a.tobytes(), bytes(point))
def test_memoryview_tobytes(self):
# Many implicit tests are already in self.verify().
t = (-529, 576, -625, 676, -729)
nd = ndarray(t, shape=[5], format='@h')
m = memoryview(nd)
self.assertEqual(m, nd)
self.assertEqual(m.tobytes(), nd.tobytes())
nd = ndarray([t], shape=[1], format='>hQiLl')
m = memoryview(nd)
self.assertEqual(m, nd)
self.assertEqual(m.tobytes(), nd.tobytes())
nd = ndarray([t for _ in range(12)], shape=[2,2,3], format='=hQiLl')
m = memoryview(nd)
self.assertEqual(m, nd)
self.assertEqual(m.tobytes(), nd.tobytes())
nd = ndarray([t for _ in range(120)], shape=[5,2,2,3,2],
format='<hQiLl')
m = memoryview(nd)
self.assertEqual(m, nd)
self.assertEqual(m.tobytes(), nd.tobytes())
# Unknown formats are handled: tobytes() purely depends on itemsize.
if ctypes:
# format: "T{>l:x:>l:y:}"
class BEPoint(ctypes.BigEndianStructure):
_fields_ = [("x", ctypes.c_long), ("y", ctypes.c_long)]
point = BEPoint(100, 200)
a = memoryview(point)
self.assertEqual(a.tobytes(), bytes(point))
def check_ctypes_datatype(datatype):
valid_datatypes = (
ctypes._SimpleCData,
ctypes.Union,
ctypes.BigEndianStructure,
ctypes.LittleEndianStructure,
ctypes.Structure,
)
for t in valid_datatypes:
if issubclass(datatype, t):
return
raise TypeError('datatype must be a ctypes data type, but was {}'.format(datatype.__name__))
def test_memoryview_compare_special_cases(self):
a = array.array('L', [1, 2, 3])
b = array.array('L', [1, 2, 7])
# Ordering comparisons raise:
v = memoryview(a)
w = memoryview(b)
for attr in ('__lt__', '__le__', '__gt__', '__ge__'):
self.assertIs(getattr(v, attr)(w), NotImplemented)
self.assertIs(getattr(a, attr)(v), NotImplemented)
# Released views compare equal to themselves:
v = memoryview(a)
v.release()
self.assertEqual(v, v)
self.assertNotEqual(v, a)
self.assertNotEqual(a, v)
v = memoryview(a)
w = memoryview(a)
w.release()
self.assertNotEqual(v, w)
self.assertNotEqual(w, v)
# Operand does not implement the buffer protocol:
v = memoryview(a)
self.assertNotEqual(v, [1, 2, 3])
# NaNs
nd = ndarray([(0, 0)], shape=[1], format='l x d x', flags=ND_WRITABLE)
nd[0] = (-1, float('nan'))
self.assertNotEqual(memoryview(nd), nd)
# Depends on issue #15625: the struct module does not understand 'u'.
a = array.array('u', 'xyz')
v = memoryview(a)
self.assertNotEqual(a, v)
self.assertNotEqual(v, a)
# Some ctypes format strings are unknown to the struct module.
if ctypes:
# format: "T{>l:x:>l:y:}"
class BEPoint(ctypes.BigEndianStructure):
_fields_ = [("x", ctypes.c_long), ("y", ctypes.c_long)]
point = BEPoint(100, 200)
a = memoryview(point)
b = memoryview(point)
self.assertNotEqual(a, b)
self.assertNotEqual(a, point)
self.assertNotEqual(point, a)
self.assertRaises(NotImplementedError, a.tolist)
def test_memoryview_compare_special_cases(self):
a = array.array('L', [1, 2, 3])
b = array.array('L', [1, 2, 7])
# Ordering comparisons raise:
v = memoryview(a)
w = memoryview(b)
for attr in ('__lt__', '__le__', '__gt__', '__ge__'):
self.assertIs(getattr(v, attr)(w), NotImplemented)
self.assertIs(getattr(a, attr)(v), NotImplemented)
# Released views compare equal to themselves:
v = memoryview(a)
v.release()
self.assertEqual(v, v)
self.assertNotEqual(v, a)
self.assertNotEqual(a, v)
v = memoryview(a)
w = memoryview(a)
w.release()
self.assertNotEqual(v, w)
self.assertNotEqual(w, v)
# Operand does not implement the buffer protocol:
v = memoryview(a)
self.assertNotEqual(v, [1, 2, 3])
# NaNs
nd = ndarray([(0, 0)], shape=[1], format='l x d x', flags=ND_WRITABLE)
nd[0] = (-1, float('nan'))
self.assertNotEqual(memoryview(nd), nd)
# Depends on issue #15625: the struct module does not understand 'u'.
a = array.array('u', 'xyz')
v = memoryview(a)
self.assertNotEqual(a, v)
self.assertNotEqual(v, a)
# Some ctypes format strings are unknown to the struct module.
if ctypes:
# format: "T{>l:x:>l:y:}"
class BEPoint(ctypes.BigEndianStructure):
_fields_ = [("x", ctypes.c_long), ("y", ctypes.c_long)]
point = BEPoint(100, 200)
a = memoryview(point)
b = memoryview(point)
self.assertNotEqual(a, b)
self.assertNotEqual(a, point)
self.assertNotEqual(point, a)
self.assertRaises(NotImplementedError, a.tolist)
def test_memoryview_compare_special_cases(self):
a = array.array('L', [1, 2, 3])
b = array.array('L', [1, 2, 7])
# Ordering comparisons raise:
v = memoryview(a)
w = memoryview(b)
for attr in ('__lt__', '__le__', '__gt__', '__ge__'):
self.assertIs(getattr(v, attr)(w), NotImplemented)
self.assertIs(getattr(a, attr)(v), NotImplemented)
# Released views compare equal to themselves:
v = memoryview(a)
v.release()
self.assertEqual(v, v)
self.assertNotEqual(v, a)
self.assertNotEqual(a, v)
v = memoryview(a)
w = memoryview(a)
w.release()
self.assertNotEqual(v, w)
self.assertNotEqual(w, v)
# Operand does not implement the buffer protocol:
v = memoryview(a)
self.assertNotEqual(v, [1, 2, 3])
# NaNs
nd = ndarray([(0, 0)], shape=[1], format='l x d x', flags=ND_WRITABLE)
nd[0] = (-1, float('nan'))
self.assertNotEqual(memoryview(nd), nd)
# Depends on issue #15625: the struct module does not understand 'u'.
a = array.array('u', 'xyz')
v = memoryview(a)
self.assertNotEqual(a, v)
self.assertNotEqual(v, a)
# Some ctypes format strings are unknown to the struct module.
if ctypes:
# format: "T{>l:x:>l:y:}"
class BEPoint(ctypes.BigEndianStructure):
_fields_ = [("x", ctypes.c_long), ("y", ctypes.c_long)]
point = BEPoint(100, 200)
a = memoryview(point)
b = memoryview(point)
self.assertNotEqual(a, b)
self.assertNotEqual(a, point)
self.assertNotEqual(point, a)
self.assertRaises(NotImplementedError, a.tolist)
