/usr/lib/python2.7/dist-packages/numpy/core/tests/test_dtype.py is in python-numpy 1:1.13.3-2ubuntu1.
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import sys
import numpy as np
from numpy.core.test_rational import rational
from numpy.testing import (
TestCase, run_module_suite, assert_, assert_equal, assert_raises,
dec
)
def assert_dtype_equal(a, b):
assert_equal(a, b)
assert_equal(hash(a), hash(b),
"two equivalent types do not hash to the same value !")
def assert_dtype_not_equal(a, b):
assert_(a != b)
assert_(hash(a) != hash(b),
"two different types hash to the same value !")
class TestBuiltin(TestCase):
def test_run(self):
"""Only test hash runs at all."""
for t in [np.int, np.float, np.complex, np.int32, np.str, np.object,
np.unicode]:
dt = np.dtype(t)
hash(dt)
def test_dtype(self):
# Make sure equivalent byte order char hash the same (e.g. < and = on
# little endian)
for t in [np.int, np.float]:
dt = np.dtype(t)
dt2 = dt.newbyteorder("<")
dt3 = dt.newbyteorder(">")
if dt == dt2:
self.assertTrue(dt.byteorder != dt2.byteorder, "bogus test")
assert_dtype_equal(dt, dt2)
else:
self.assertTrue(dt.byteorder != dt3.byteorder, "bogus test")
assert_dtype_equal(dt, dt3)
def test_equivalent_dtype_hashing(self):
# Make sure equivalent dtypes with different type num hash equal
uintp = np.dtype(np.uintp)
if uintp.itemsize == 4:
left = uintp
right = np.dtype(np.uint32)
else:
left = uintp
right = np.dtype(np.ulonglong)
self.assertTrue(left == right)
self.assertTrue(hash(left) == hash(right))
def test_invalid_types(self):
# Make sure invalid type strings raise an error
assert_raises(TypeError, np.dtype, 'O3')
assert_raises(TypeError, np.dtype, 'O5')
assert_raises(TypeError, np.dtype, 'O7')
assert_raises(TypeError, np.dtype, 'b3')
assert_raises(TypeError, np.dtype, 'h4')
assert_raises(TypeError, np.dtype, 'I5')
assert_raises(TypeError, np.dtype, 'e3')
assert_raises(TypeError, np.dtype, 'f5')
if np.dtype('g').itemsize == 8 or np.dtype('g').itemsize == 16:
assert_raises(TypeError, np.dtype, 'g12')
elif np.dtype('g').itemsize == 12:
assert_raises(TypeError, np.dtype, 'g16')
if np.dtype('l').itemsize == 8:
assert_raises(TypeError, np.dtype, 'l4')
assert_raises(TypeError, np.dtype, 'L4')
else:
assert_raises(TypeError, np.dtype, 'l8')
assert_raises(TypeError, np.dtype, 'L8')
if np.dtype('q').itemsize == 8:
assert_raises(TypeError, np.dtype, 'q4')
assert_raises(TypeError, np.dtype, 'Q4')
else:
assert_raises(TypeError, np.dtype, 'q8')
assert_raises(TypeError, np.dtype, 'Q8')
def test_bad_param(self):
# Can't give a size that's too small
assert_raises(ValueError, np.dtype,
{'names':['f0', 'f1'],
'formats':['i4', 'i1'],
'offsets':[0, 4],
'itemsize':4})
# If alignment is enabled, the alignment (4) must divide the itemsize
assert_raises(ValueError, np.dtype,
{'names':['f0', 'f1'],
'formats':['i4', 'i1'],
'offsets':[0, 4],
'itemsize':9}, align=True)
# If alignment is enabled, the individual fields must be aligned
assert_raises(ValueError, np.dtype,
{'names':['f0', 'f1'],
'formats':['i1', 'f4'],
'offsets':[0, 2]}, align=True)
class TestRecord(TestCase):
def test_equivalent_record(self):
"""Test whether equivalent record dtypes hash the same."""
a = np.dtype([('yo', np.int)])
b = np.dtype([('yo', np.int)])
assert_dtype_equal(a, b)
def test_different_names(self):
# In theory, they may hash the same (collision) ?
a = np.dtype([('yo', np.int)])
b = np.dtype([('ye', np.int)])
assert_dtype_not_equal(a, b)
def test_different_titles(self):
# In theory, they may hash the same (collision) ?
a = np.dtype({'names': ['r', 'b'],
'formats': ['u1', 'u1'],
'titles': ['Red pixel', 'Blue pixel']})
b = np.dtype({'names': ['r', 'b'],
'formats': ['u1', 'u1'],
'titles': ['RRed pixel', 'Blue pixel']})
assert_dtype_not_equal(a, b)
def test_mutate(self):
# Mutating a dtype should reset the cached hash value
a = np.dtype([('yo', np.int)])
b = np.dtype([('yo', np.int)])
c = np.dtype([('ye', np.int)])
assert_dtype_equal(a, b)
assert_dtype_not_equal(a, c)
a.names = ['ye']
assert_dtype_equal(a, c)
assert_dtype_not_equal(a, b)
state = b.__reduce__()[2]
a.__setstate__(state)
assert_dtype_equal(a, b)
assert_dtype_not_equal(a, c)
def test_not_lists(self):
"""Test if an appropriate exception is raised when passing bad values to
the dtype constructor.
"""
self.assertRaises(TypeError, np.dtype,
dict(names=set(['A', 'B']), formats=['f8', 'i4']))
self.assertRaises(TypeError, np.dtype,
dict(names=['A', 'B'], formats=set(['f8', 'i4'])))
def test_aligned_size(self):
# Check that structured dtypes get padded to an aligned size
dt = np.dtype('i4, i1', align=True)
assert_equal(dt.itemsize, 8)
dt = np.dtype([('f0', 'i4'), ('f1', 'i1')], align=True)
assert_equal(dt.itemsize, 8)
dt = np.dtype({'names':['f0', 'f1'],
'formats':['i4', 'u1'],
'offsets':[0, 4]}, align=True)
assert_equal(dt.itemsize, 8)
dt = np.dtype({'f0': ('i4', 0), 'f1':('u1', 4)}, align=True)
assert_equal(dt.itemsize, 8)
# Nesting should preserve that alignment
dt1 = np.dtype([('f0', 'i4'),
('f1', [('f1', 'i1'), ('f2', 'i4'), ('f3', 'i1')]),
('f2', 'i1')], align=True)
assert_equal(dt1.itemsize, 20)
dt2 = np.dtype({'names':['f0', 'f1', 'f2'],
'formats':['i4',
[('f1', 'i1'), ('f2', 'i4'), ('f3', 'i1')],
'i1'],
'offsets':[0, 4, 16]}, align=True)
assert_equal(dt2.itemsize, 20)
dt3 = np.dtype({'f0': ('i4', 0),
'f1': ([('f1', 'i1'), ('f2', 'i4'), ('f3', 'i1')], 4),
'f2': ('i1', 16)}, align=True)
assert_equal(dt3.itemsize, 20)
assert_equal(dt1, dt2)
assert_equal(dt2, dt3)
# Nesting should preserve packing
dt1 = np.dtype([('f0', 'i4'),
('f1', [('f1', 'i1'), ('f2', 'i4'), ('f3', 'i1')]),
('f2', 'i1')], align=False)
assert_equal(dt1.itemsize, 11)
dt2 = np.dtype({'names':['f0', 'f1', 'f2'],
'formats':['i4',
[('f1', 'i1'), ('f2', 'i4'), ('f3', 'i1')],
'i1'],
'offsets':[0, 4, 10]}, align=False)
assert_equal(dt2.itemsize, 11)
dt3 = np.dtype({'f0': ('i4', 0),
'f1': ([('f1', 'i1'), ('f2', 'i4'), ('f3', 'i1')], 4),
'f2': ('i1', 10)}, align=False)
assert_equal(dt3.itemsize, 11)
assert_equal(dt1, dt2)
assert_equal(dt2, dt3)
def test_union_struct(self):
# Should be able to create union dtypes
dt = np.dtype({'names':['f0', 'f1', 'f2'], 'formats':['<u4', '<u2', '<u2'],
'offsets':[0, 0, 2]}, align=True)
assert_equal(dt.itemsize, 4)
a = np.array([3], dtype='<u4').view(dt)
a['f1'] = 10
a['f2'] = 36
assert_equal(a['f0'], 10 + 36*256*256)
# Should be able to specify fields out of order
dt = np.dtype({'names':['f0', 'f1', 'f2'], 'formats':['<u4', '<u2', '<u2'],
'offsets':[4, 0, 2]}, align=True)
assert_equal(dt.itemsize, 8)
dt2 = np.dtype({'names':['f2', 'f0', 'f1'],
'formats':['<u2', '<u4', '<u2'],
'offsets':[2, 4, 0]}, align=True)
vals = [(0, 1, 2), (3, -1, 4)]
vals2 = [(2, 0, 1), (4, 3, -1)]
a = np.array(vals, dt)
b = np.array(vals2, dt2)
assert_equal(a.astype(dt2), b)
assert_equal(b.astype(dt), a)
assert_equal(a.view(dt2), b)
assert_equal(b.view(dt), a)
# Should not be able to overlap objects with other types
assert_raises(TypeError, np.dtype,
{'names':['f0', 'f1'],
'formats':['O', 'i1'],
'offsets':[0, 2]})
assert_raises(TypeError, np.dtype,
{'names':['f0', 'f1'],
'formats':['i4', 'O'],
'offsets':[0, 3]})
assert_raises(TypeError, np.dtype,
{'names':['f0', 'f1'],
'formats':[[('a', 'O')], 'i1'],
'offsets':[0, 2]})
assert_raises(TypeError, np.dtype,
{'names':['f0', 'f1'],
'formats':['i4', [('a', 'O')]],
'offsets':[0, 3]})
# Out of order should still be ok, however
dt = np.dtype({'names':['f0', 'f1'],
'formats':['i1', 'O'],
'offsets':[np.dtype('intp').itemsize, 0]})
def test_comma_datetime(self):
dt = np.dtype('M8[D],datetime64[Y],i8')
assert_equal(dt, np.dtype([('f0', 'M8[D]'),
('f1', 'datetime64[Y]'),
('f2', 'i8')]))
def test_from_dictproxy(self):
# Tests for PR #5920
dt = np.dtype({'names': ['a', 'b'], 'formats': ['i4', 'f4']})
assert_dtype_equal(dt, np.dtype(dt.fields))
dt2 = np.dtype((np.void, dt.fields))
assert_equal(dt2.fields, dt.fields)
def test_from_dict_with_zero_width_field(self):
# Regression test for #6430 / #2196
dt = np.dtype([('val1', np.float32, (0,)), ('val2', int)])
dt2 = np.dtype({'names': ['val1', 'val2'],
'formats': [(np.float32, (0,)), int]})
assert_dtype_equal(dt, dt2)
assert_equal(dt.fields['val1'][0].itemsize, 0)
assert_equal(dt.itemsize, dt.fields['val2'][0].itemsize)
def test_bool_commastring(self):
d = np.dtype('?,?,?') # raises?
assert_equal(len(d.names), 3)
for n in d.names:
assert_equal(d.fields[n][0], np.dtype('?'))
def test_nonint_offsets(self):
# gh-8059
def make_dtype(off):
return np.dtype({'names': ['A'], 'formats': ['i4'],
'offsets': [off]})
assert_raises(TypeError, make_dtype, 'ASD')
assert_raises(OverflowError, make_dtype, 2**70)
assert_raises(TypeError, make_dtype, 2.3)
assert_raises(ValueError, make_dtype, -10)
# no errors here:
dt = make_dtype(np.uint32(0))
np.zeros(1, dtype=dt)[0].item()
class TestSubarray(TestCase):
def test_single_subarray(self):
a = np.dtype((np.int, (2)))
b = np.dtype((np.int, (2,)))
assert_dtype_equal(a, b)
assert_equal(type(a.subdtype[1]), tuple)
assert_equal(type(b.subdtype[1]), tuple)
def test_equivalent_record(self):
"""Test whether equivalent subarray dtypes hash the same."""
a = np.dtype((np.int, (2, 3)))
b = np.dtype((np.int, (2, 3)))
assert_dtype_equal(a, b)
def test_nonequivalent_record(self):
"""Test whether different subarray dtypes hash differently."""
a = np.dtype((np.int, (2, 3)))
b = np.dtype((np.int, (3, 2)))
assert_dtype_not_equal(a, b)
a = np.dtype((np.int, (2, 3)))
b = np.dtype((np.int, (2, 2)))
assert_dtype_not_equal(a, b)
a = np.dtype((np.int, (1, 2, 3)))
b = np.dtype((np.int, (1, 2)))
assert_dtype_not_equal(a, b)
def test_shape_equal(self):
"""Test some data types that are equal"""
assert_dtype_equal(np.dtype('f8'), np.dtype(('f8', tuple())))
assert_dtype_equal(np.dtype('f8'), np.dtype(('f8', 1)))
assert_dtype_equal(np.dtype((np.int, 2)), np.dtype((np.int, (2,))))
assert_dtype_equal(np.dtype(('<f4', (3, 2))), np.dtype(('<f4', (3, 2))))
d = ([('a', 'f4', (1, 2)), ('b', 'f8', (3, 1))], (3, 2))
assert_dtype_equal(np.dtype(d), np.dtype(d))
def test_shape_simple(self):
"""Test some simple cases that shouldn't be equal"""
assert_dtype_not_equal(np.dtype('f8'), np.dtype(('f8', (1,))))
assert_dtype_not_equal(np.dtype(('f8', (1,))), np.dtype(('f8', (1, 1))))
assert_dtype_not_equal(np.dtype(('f4', (3, 2))), np.dtype(('f4', (2, 3))))
def test_shape_monster(self):
"""Test some more complicated cases that shouldn't be equal"""
assert_dtype_not_equal(
np.dtype(([('a', 'f4', (2, 1)), ('b', 'f8', (1, 3))], (2, 2))),
np.dtype(([('a', 'f4', (1, 2)), ('b', 'f8', (1, 3))], (2, 2))))
assert_dtype_not_equal(
np.dtype(([('a', 'f4', (2, 1)), ('b', 'f8', (1, 3))], (2, 2))),
np.dtype(([('a', 'f4', (2, 1)), ('b', 'i8', (1, 3))], (2, 2))))
assert_dtype_not_equal(
np.dtype(([('a', 'f4', (2, 1)), ('b', 'f8', (1, 3))], (2, 2))),
np.dtype(([('e', 'f8', (1, 3)), ('d', 'f4', (2, 1))], (2, 2))))
assert_dtype_not_equal(
np.dtype(([('a', [('a', 'i4', 6)], (2, 1)), ('b', 'f8', (1, 3))], (2, 2))),
np.dtype(([('a', [('a', 'u4', 6)], (2, 1)), ('b', 'f8', (1, 3))], (2, 2))))
def test_shape_sequence(self):
# Any sequence of integers should work as shape, but the result
# should be a tuple (immutable) of base type integers.
a = np.array([1, 2, 3], dtype=np.int16)
l = [1, 2, 3]
# Array gets converted
dt = np.dtype([('a', 'f4', a)])
assert_(isinstance(dt['a'].shape, tuple))
assert_(isinstance(dt['a'].shape[0], int))
# List gets converted
dt = np.dtype([('a', 'f4', l)])
assert_(isinstance(dt['a'].shape, tuple))
#
class IntLike(object):
def __index__(self):
return 3
def __int__(self):
# (a PyNumber_Check fails without __int__)
return 3
dt = np.dtype([('a', 'f4', IntLike())])
assert_(isinstance(dt['a'].shape, tuple))
assert_(isinstance(dt['a'].shape[0], int))
dt = np.dtype([('a', 'f4', (IntLike(),))])
assert_(isinstance(dt['a'].shape, tuple))
assert_(isinstance(dt['a'].shape[0], int))
def test_shape_matches_ndim(self):
dt = np.dtype([('a', 'f4', ())])
assert_equal(dt['a'].shape, ())
assert_equal(dt['a'].ndim, 0)
dt = np.dtype([('a', 'f4')])
assert_equal(dt['a'].shape, ())
assert_equal(dt['a'].ndim, 0)
dt = np.dtype([('a', 'f4', 4)])
assert_equal(dt['a'].shape, (4,))
assert_equal(dt['a'].ndim, 1)
dt = np.dtype([('a', 'f4', (1, 2, 3))])
assert_equal(dt['a'].shape, (1, 2, 3))
assert_equal(dt['a'].ndim, 3)
def test_shape_invalid(self):
# Check that the shape is valid.
max_int = np.iinfo(np.intc).max
max_intp = np.iinfo(np.intp).max
# Too large values (the datatype is part of this)
assert_raises(ValueError, np.dtype, [('a', 'f4', max_int // 4 + 1)])
assert_raises(ValueError, np.dtype, [('a', 'f4', max_int + 1)])
assert_raises(ValueError, np.dtype, [('a', 'f4', (max_int, 2))])
# Takes a different code path (fails earlier:
assert_raises(ValueError, np.dtype, [('a', 'f4', max_intp + 1)])
# Negative values
assert_raises(ValueError, np.dtype, [('a', 'f4', -1)])
assert_raises(ValueError, np.dtype, [('a', 'f4', (-1, -1))])
def test_alignment(self):
#Check that subarrays are aligned
t1 = np.dtype('1i4', align=True)
t2 = np.dtype('2i4', align=True)
assert_equal(t1.alignment, t2.alignment)
class TestMonsterType(TestCase):
"""Test deeply nested subtypes."""
def test1(self):
simple1 = np.dtype({'names': ['r', 'b'], 'formats': ['u1', 'u1'],
'titles': ['Red pixel', 'Blue pixel']})
a = np.dtype([('yo', np.int), ('ye', simple1),
('yi', np.dtype((np.int, (3, 2))))])
b = np.dtype([('yo', np.int), ('ye', simple1),
('yi', np.dtype((np.int, (3, 2))))])
assert_dtype_equal(a, b)
c = np.dtype([('yo', np.int), ('ye', simple1),
('yi', np.dtype((a, (3, 2))))])
d = np.dtype([('yo', np.int), ('ye', simple1),
('yi', np.dtype((a, (3, 2))))])
assert_dtype_equal(c, d)
class TestMetadata(TestCase):
def test_no_metadata(self):
d = np.dtype(int)
self.assertEqual(d.metadata, None)
def test_metadata_takes_dict(self):
d = np.dtype(int, metadata={'datum': 1})
self.assertEqual(d.metadata, {'datum': 1})
def test_metadata_rejects_nondict(self):
self.assertRaises(TypeError, np.dtype, int, metadata='datum')
self.assertRaises(TypeError, np.dtype, int, metadata=1)
self.assertRaises(TypeError, np.dtype, int, metadata=None)
def test_nested_metadata(self):
d = np.dtype([('a', np.dtype(int, metadata={'datum': 1}))])
self.assertEqual(d['a'].metadata, {'datum': 1})
def base_metadata_copied(self):
d = np.dtype((np.void, np.dtype('i4,i4', metadata={'datum': 1})))
assert_equal(d.metadata, {'datum': 1})
class TestString(TestCase):
def test_complex_dtype_str(self):
dt = np.dtype([('top', [('tiles', ('>f4', (64, 64)), (1,)),
('rtile', '>f4', (64, 36))], (3,)),
('bottom', [('bleft', ('>f4', (8, 64)), (1,)),
('bright', '>f4', (8, 36))])])
assert_equal(str(dt),
"[('top', [('tiles', ('>f4', (64, 64)), (1,)), "
"('rtile', '>f4', (64, 36))], (3,)), "
"('bottom', [('bleft', ('>f4', (8, 64)), (1,)), "
"('bright', '>f4', (8, 36))])]")
# If the sticky aligned flag is set to True, it makes the
# str() function use a dict representation with an 'aligned' flag
dt = np.dtype([('top', [('tiles', ('>f4', (64, 64)), (1,)),
('rtile', '>f4', (64, 36))],
(3,)),
('bottom', [('bleft', ('>f4', (8, 64)), (1,)),
('bright', '>f4', (8, 36))])],
align=True)
assert_equal(str(dt),
"{'names':['top','bottom'], "
"'formats':[([('tiles', ('>f4', (64, 64)), (1,)), "
"('rtile', '>f4', (64, 36))], (3,)),"
"[('bleft', ('>f4', (8, 64)), (1,)), "
"('bright', '>f4', (8, 36))]], "
"'offsets':[0,76800], "
"'itemsize':80000, "
"'aligned':True}")
assert_equal(np.dtype(eval(str(dt))), dt)
dt = np.dtype({'names': ['r', 'g', 'b'], 'formats': ['u1', 'u1', 'u1'],
'offsets': [0, 1, 2],
'titles': ['Red pixel', 'Green pixel', 'Blue pixel']})
assert_equal(str(dt),
"[(('Red pixel', 'r'), 'u1'), "
"(('Green pixel', 'g'), 'u1'), "
"(('Blue pixel', 'b'), 'u1')]")
dt = np.dtype({'names': ['rgba', 'r', 'g', 'b'],
'formats': ['<u4', 'u1', 'u1', 'u1'],
'offsets': [0, 0, 1, 2],
'titles': ['Color', 'Red pixel',
'Green pixel', 'Blue pixel']})
assert_equal(str(dt),
"{'names':['rgba','r','g','b'],"
" 'formats':['<u4','u1','u1','u1'],"
" 'offsets':[0,0,1,2],"
" 'titles':['Color','Red pixel',"
"'Green pixel','Blue pixel'],"
" 'itemsize':4}")
dt = np.dtype({'names': ['r', 'b'], 'formats': ['u1', 'u1'],
'offsets': [0, 2],
'titles': ['Red pixel', 'Blue pixel']})
assert_equal(str(dt),
"{'names':['r','b'],"
" 'formats':['u1','u1'],"
" 'offsets':[0,2],"
" 'titles':['Red pixel','Blue pixel'],"
" 'itemsize':3}")
dt = np.dtype([('a', '<m8[D]'), ('b', '<M8[us]')])
assert_equal(str(dt),
"[('a', '<m8[D]'), ('b', '<M8[us]')]")
def test_complex_dtype_repr(self):
dt = np.dtype([('top', [('tiles', ('>f4', (64, 64)), (1,)),
('rtile', '>f4', (64, 36))], (3,)),
('bottom', [('bleft', ('>f4', (8, 64)), (1,)),
('bright', '>f4', (8, 36))])])
assert_equal(repr(dt),
"dtype([('top', [('tiles', ('>f4', (64, 64)), (1,)), "
"('rtile', '>f4', (64, 36))], (3,)), "
"('bottom', [('bleft', ('>f4', (8, 64)), (1,)), "
"('bright', '>f4', (8, 36))])])")
dt = np.dtype({'names': ['r', 'g', 'b'], 'formats': ['u1', 'u1', 'u1'],
'offsets': [0, 1, 2],
'titles': ['Red pixel', 'Green pixel', 'Blue pixel']},
align=True)
assert_equal(repr(dt),
"dtype([(('Red pixel', 'r'), 'u1'), "
"(('Green pixel', 'g'), 'u1'), "
"(('Blue pixel', 'b'), 'u1')], align=True)")
dt = np.dtype({'names': ['rgba', 'r', 'g', 'b'],
'formats': ['<u4', 'u1', 'u1', 'u1'],
'offsets': [0, 0, 1, 2],
'titles': ['Color', 'Red pixel',
'Green pixel', 'Blue pixel']}, align=True)
assert_equal(repr(dt),
"dtype({'names':['rgba','r','g','b'],"
" 'formats':['<u4','u1','u1','u1'],"
" 'offsets':[0,0,1,2],"
" 'titles':['Color','Red pixel',"
"'Green pixel','Blue pixel'],"
" 'itemsize':4}, align=True)")
dt = np.dtype({'names': ['r', 'b'], 'formats': ['u1', 'u1'],
'offsets': [0, 2],
'titles': ['Red pixel', 'Blue pixel'],
'itemsize': 4})
assert_equal(repr(dt),
"dtype({'names':['r','b'], "
"'formats':['u1','u1'], "
"'offsets':[0,2], "
"'titles':['Red pixel','Blue pixel'], "
"'itemsize':4})")
dt = np.dtype([('a', '<M8[D]'), ('b', '<m8[us]')])
assert_equal(repr(dt),
"dtype([('a', '<M8[D]'), ('b', '<m8[us]')])")
@dec.skipif(sys.version_info[0] >= 3)
def test_dtype_str_with_long_in_shape(self):
# Pull request #376, should not error
np.dtype('(1L,)i4')
def test_base_dtype_with_object_type(self):
# Issue gh-2798, should not error.
np.array(['a'], dtype="O").astype(("O", [("name", "O")]))
def test_empty_string_to_object(self):
# Pull request #4722
np.array(["", ""]).astype(object)
class TestDtypeAttributeDeletion(TestCase):
def test_dtype_non_writable_attributes_deletion(self):
dt = np.dtype(np.double)
attr = ["subdtype", "descr", "str", "name", "base", "shape",
"isbuiltin", "isnative", "isalignedstruct", "fields",
"metadata", "hasobject"]
for s in attr:
assert_raises(AttributeError, delattr, dt, s)
def test_dtype_writable_attributes_deletion(self):
dt = np.dtype(np.double)
attr = ["names"]
for s in attr:
assert_raises(AttributeError, delattr, dt, s)
class TestDtypeAttributes(TestCase):
def test_descr_has_trailing_void(self):
# see gh-6359
dtype = np.dtype({
'names': ['A', 'B'],
'formats': ['f4', 'f4'],
'offsets': [0, 8],
'itemsize': 16})
new_dtype = np.dtype(dtype.descr)
assert_equal(new_dtype.itemsize, 16)
def test_name_builtin(self):
for t in np.typeDict.values():
name = t.__name__
if name.endswith('_'):
name = name[:-1]
assert_equal(np.dtype(t).name, name)
def test_name_dtype_subclass(self):
# Ticket #4357
class user_def_subcls(np.void):
pass
assert_equal(np.dtype(user_def_subcls).name, 'user_def_subcls')
def test_rational_dtype():
# test for bug gh-5719
a = np.array([1111], dtype=rational).astype
assert_raises(OverflowError, a, 'int8')
# test that dtype detection finds user-defined types
x = rational(1)
assert_equal(np.array([x,x]).dtype, np.dtype(rational))
def test_dtypes_are_true():
# test for gh-6294
assert bool(np.dtype('f8'))
assert bool(np.dtype('i8'))
assert bool(np.dtype([('a', 'i8'), ('b', 'f4')]))
if __name__ == "__main__":
run_module_suite()
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