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106 lines
3.5 KiB
Python
106 lines
3.5 KiB
Python
"""
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Test scalar buffer interface adheres to PEP 3118
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"""
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import sys
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import numpy as np
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import pytest
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from numpy.testing import assert_, assert_equal, assert_raises
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# PEP3118 format strings for native (standard alignment and byteorder) types
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scalars_and_codes = [
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(np.bool_, '?'),
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(np.byte, 'b'),
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(np.short, 'h'),
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(np.intc, 'i'),
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(np.int_, 'l'),
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(np.longlong, 'q'),
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(np.ubyte, 'B'),
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(np.ushort, 'H'),
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(np.uintc, 'I'),
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(np.uint, 'L'),
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(np.ulonglong, 'Q'),
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(np.half, 'e'),
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(np.single, 'f'),
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(np.double, 'd'),
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(np.longdouble, 'g'),
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(np.csingle, 'Zf'),
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(np.cdouble, 'Zd'),
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(np.clongdouble, 'Zg'),
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]
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scalars_only, codes_only = zip(*scalars_and_codes)
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@pytest.mark.skipif(sys.version_info.major < 3,
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reason="Python 2 scalars lack a buffer interface")
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class TestScalarPEP3118(object):
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@pytest.mark.parametrize('scalar', scalars_only, ids=codes_only)
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def test_scalar_match_array(self, scalar):
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x = scalar()
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a = np.array([], dtype=np.dtype(scalar))
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mv_x = memoryview(x)
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mv_a = memoryview(a)
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assert_equal(mv_x.format, mv_a.format)
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@pytest.mark.parametrize('scalar', scalars_only, ids=codes_only)
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def test_scalar_dim(self, scalar):
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x = scalar()
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mv_x = memoryview(x)
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assert_equal(mv_x.itemsize, np.dtype(scalar).itemsize)
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assert_equal(mv_x.ndim, 0)
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assert_equal(mv_x.shape, ())
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assert_equal(mv_x.strides, ())
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assert_equal(mv_x.suboffsets, ())
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@pytest.mark.parametrize('scalar, code', scalars_and_codes, ids=codes_only)
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def test_scalar_known_code(self, scalar, code):
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x = scalar()
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mv_x = memoryview(x)
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assert_equal(mv_x.format, code)
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def test_void_scalar_structured_data(self):
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dt = np.dtype([('name', np.unicode_, 16), ('grades', np.float64, (2,))])
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x = np.array(('ndarray_scalar', (1.2, 3.0)), dtype=dt)[()]
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assert_(isinstance(x, np.void))
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mv_x = memoryview(x)
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expected_size = 16 * np.dtype((np.unicode_, 1)).itemsize
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expected_size += 2 * np.dtype((np.float64, 1)).itemsize
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assert_equal(mv_x.itemsize, expected_size)
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assert_equal(mv_x.ndim, 0)
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assert_equal(mv_x.shape, ())
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assert_equal(mv_x.strides, ())
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assert_equal(mv_x.suboffsets, ())
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# check scalar format string against ndarray format string
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a = np.array([('Sarah', (8.0, 7.0)), ('John', (6.0, 7.0))], dtype=dt)
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assert_(isinstance(a, np.ndarray))
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mv_a = memoryview(a)
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assert_equal(mv_x.itemsize, mv_a.itemsize)
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assert_equal(mv_x.format, mv_a.format)
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def test_datetime_memoryview(self):
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# gh-11656
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# Values verified with v1.13.3, shape is not () as in test_scalar_dim
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def as_dict(m):
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return dict(strides=m.strides, shape=m.shape, itemsize=m.itemsize,
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ndim=m.ndim, format=m.format)
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dt1 = np.datetime64('2016-01-01')
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dt2 = np.datetime64('2017-01-01')
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expected = {'strides': (1,), 'itemsize': 1, 'ndim': 1,
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'shape': (8,), 'format': 'B'}
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v = memoryview(dt1)
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res = as_dict(v)
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assert_equal(res, expected)
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v = memoryview(dt2 - dt1)
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res = as_dict(v)
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assert_equal(res, expected)
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dt = np.dtype([('a', 'uint16'), ('b', 'M8[s]')])
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a = np.empty(1, dt)
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# Fails to create a PEP 3118 valid buffer
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assert_raises((ValueError, BufferError), memoryview, a[0])
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