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import math
import random
import platform
import sys
import unittest
import warnings
from test.test_capi.test_getargs import (Float, FloatSubclass, FloatSubclass2,
BadIndex2, BadFloat2, Index, BadIndex,
BadFloat)
from test.support import import_helper
_testcapi = import_helper.import_module('_testcapi')
_testlimitedcapi = import_helper.import_module('_testlimitedcapi')
NULL = None
# For PyFloat_Pack/Unpack*
BIG_ENDIAN = 0
LITTLE_ENDIAN = 1
EPSILON = {
2: 2.0 ** -11, # binary16
4: 2.0 ** -24, # binary32
8: 2.0 ** -53, # binary64
}
HAVE_IEEE_754 = float.__getformat__("double").startswith("IEEE")
INF = float("inf")
NAN = float("nan")
def make_nan(size, sign, quiet, payload=None):
if size == 8:
payload_mask = 0x7ffffffffffff
i = (sign << 63) + (0x7ff << 52) + (quiet << 51)
elif size == 4:
payload_mask = 0x3fffff
i = (sign << 31) + (0xff << 23) + (quiet << 22)
elif size == 2:
payload_mask = 0x1ff
i = (sign << 15) + (0x1f << 10) + (quiet << 9)
else:
raise ValueError("size must be either 2, 4, or 8")
if payload is None:
payload = random.randint(not quiet, payload_mask)
return i + payload
class CAPIFloatTest(unittest.TestCase):
def test_check(self):
# Test PyFloat_Check()
check = _testlimitedcapi.float_check
self.assertTrue(check(4.25))
self.assertTrue(check(FloatSubclass(4.25)))
self.assertFalse(check(Float()))
self.assertFalse(check(3))
self.assertFalse(check(object()))
# CRASHES check(NULL)
def test_checkexact(self):
# Test PyFloat_CheckExact()
checkexact = _testlimitedcapi.float_checkexact
self.assertTrue(checkexact(4.25))
self.assertFalse(checkexact(FloatSubclass(4.25)))
self.assertFalse(checkexact(Float()))
self.assertFalse(checkexact(3))
self.assertFalse(checkexact(object()))
# CRASHES checkexact(NULL)
def test_fromstring(self):
# Test PyFloat_FromString()
fromstring = _testlimitedcapi.float_fromstring
self.assertEqual(fromstring("4.25"), 4.25)
self.assertEqual(fromstring(b"4.25"), 4.25)
self.assertRaises(ValueError, fromstring, "4.25\0")
self.assertRaises(ValueError, fromstring, b"4.25\0")
self.assertEqual(fromstring(bytearray(b"4.25")), 4.25)
self.assertEqual(fromstring(memoryview(b"4.25")), 4.25)
self.assertEqual(fromstring(memoryview(b"4.255")[:-1]), 4.25)
self.assertRaises(TypeError, fromstring, memoryview(b"4.25")[::2])
self.assertRaises(TypeError, fromstring, 4.25)
# CRASHES fromstring(NULL)
def test_fromdouble(self):
# Test PyFloat_FromDouble()
fromdouble = _testlimitedcapi.float_fromdouble
self.assertEqual(fromdouble(4.25), 4.25)
def test_asdouble(self):
# Test PyFloat_AsDouble()
asdouble = _testlimitedcapi.float_asdouble
class BadFloat3:
def __float__(self):
raise RuntimeError
self.assertEqual(asdouble(4.25), 4.25)
self.assertEqual(asdouble(-1.0), -1.0)
self.assertEqual(asdouble(42), 42.0)
self.assertEqual(asdouble(-1), -1.0)
self.assertEqual(asdouble(2**1000), float(2**1000))
self.assertEqual(asdouble(FloatSubclass(4.25)), 4.25)
self.assertEqual(asdouble(FloatSubclass2(4.25)), 4.25)
self.assertEqual(asdouble(Index()), 99.)
self.assertRaises(TypeError, asdouble, BadIndex())
self.assertRaises(TypeError, asdouble, BadFloat())
self.assertRaises(RuntimeError, asdouble, BadFloat3())
with self.assertWarns(DeprecationWarning):
self.assertEqual(asdouble(BadIndex2()), 1.)
with self.assertWarns(DeprecationWarning):
self.assertEqual(asdouble(BadFloat2()), 4.25)
with warnings.catch_warnings():
warnings.simplefilter("error", DeprecationWarning)
self.assertRaises(DeprecationWarning, asdouble, BadFloat2())
self.assertRaises(TypeError, asdouble, object())
self.assertRaises(TypeError, asdouble, NULL)
def test_getinfo(self):
# Test PyFloat_GetInfo()
getinfo = _testlimitedcapi.float_getinfo
self.assertEqual(getinfo(), sys.float_info)
def test_getmax(self):
# Test PyFloat_GetMax()
getmax = _testlimitedcapi.float_getmax
self.assertEqual(getmax(), sys.float_info.max)
def test_getmin(self):
# Test PyFloat_GetMax()
getmin = _testlimitedcapi.float_getmin
self.assertEqual(getmin(), sys.float_info.min)
def test_pack(self):
# Test PyFloat_Pack2(), PyFloat_Pack4() and PyFloat_Pack8()
pack = _testcapi.float_pack
self.assertEqual(pack(2, 1.5, BIG_ENDIAN), b'>\x00')
self.assertEqual(pack(4, 1.5, BIG_ENDIAN), b'?\xc0\x00\x00')
self.assertEqual(pack(8, 1.5, BIG_ENDIAN),
b'?\xf8\x00\x00\x00\x00\x00\x00')
self.assertEqual(pack(2, 1.5, LITTLE_ENDIAN), b'\x00>')
self.assertEqual(pack(4, 1.5, LITTLE_ENDIAN), b'\x00\x00\xc0?')
self.assertEqual(pack(8, 1.5, LITTLE_ENDIAN),
b'\x00\x00\x00\x00\x00\x00\xf8?')
def test_unpack(self):
# Test PyFloat_Unpack2(), PyFloat_Unpack4() and PyFloat_Unpack8()
unpack = _testcapi.float_unpack
self.assertEqual(unpack(b'>\x00', BIG_ENDIAN), 1.5)
self.assertEqual(unpack(b'?\xc0\x00\x00', BIG_ENDIAN), 1.5)
self.assertEqual(unpack(b'?\xf8\x00\x00\x00\x00\x00\x00', BIG_ENDIAN),
1.5)
self.assertEqual(unpack(b'\x00>', LITTLE_ENDIAN), 1.5)
self.assertEqual(unpack(b'\x00\x00\xc0?', LITTLE_ENDIAN), 1.5)
self.assertEqual(unpack(b'\x00\x00\x00\x00\x00\x00\xf8?', LITTLE_ENDIAN),
1.5)
def test_pack_unpack_roundtrip(self):
pack = _testcapi.float_pack
unpack = _testcapi.float_unpack
large = 2.0 ** 100
values = [1.0, 1.5, large, 1.0/7, math.pi]
if HAVE_IEEE_754:
values.extend((INF, NAN))
for value in values:
for size in (2, 4, 8,):
if size == 2 and value == large:
# too large for 16-bit float
continue
rel_tol = EPSILON[size]
for endian in (BIG_ENDIAN, LITTLE_ENDIAN):
with self.subTest(value=value, size=size, endian=endian):
data = pack(size, value, endian)
value2 = unpack(data, endian)
if math.isnan(value):
self.assertTrue(math.isnan(value2), (value, value2))
elif size < 8:
self.assertTrue(math.isclose(value2, value, rel_tol=rel_tol),
(value, value2))
else:
self.assertEqual(value2, value)
@unittest.skipUnless(HAVE_IEEE_754, "requires IEEE 754")
def test_pack_unpack_roundtrip_for_nans(self):
pack = _testcapi.float_pack
unpack = _testcapi.float_unpack
for _ in range(10):
for size in (2, 4, 8):
sign = random.randint(0, 1)
if sys.maxsize != 2147483647: # not it 32-bit mode
signaling = random.randint(0, 1)
else:
# Skip sNaN's on x86 (32-bit). The problem is that sNaN
# doubles become qNaN doubles just by the C calling
# convention, there is no way to preserve sNaN doubles
# between C function calls with the current
# PyFloat_Pack/Unpack*() API. See also gh-130317 and
# e.g. https://developercommunity.visualstudio.com/t/155064
signaling = 0
if platform.machine().startswith('parisc'):
# HP PA RISC uses 0 for quiet, see:
# https://en.wikipedia.org/wiki/NaN#Encoding
signaling = 1
i = make_nan(size, sign, not signaling)
data = bytes.fromhex(f'{i:x}')
for endian in (BIG_ENDIAN, LITTLE_ENDIAN):
with self.subTest(data=data, size=size, endian=endian):
data1 = data if endian == BIG_ENDIAN else data[::-1]
value = unpack(data1, endian)
data2 = pack(size, value, endian)
self.assertTrue(math.isnan(value))
self.assertEqual(data1, data2)
@unittest.skipUnless(HAVE_IEEE_754, "requires IEEE 754")
@unittest.skipUnless(sys.maxsize != 2147483647, "requires 64-bit mode")
def test_pack_unpack_nans_for_different_formats(self):
pack = _testcapi.float_pack
unpack = _testcapi.float_unpack
for endian in (BIG_ENDIAN, LITTLE_ENDIAN):
with self.subTest(endian=endian):
byteorder = "big" if endian == BIG_ENDIAN else "little"
# Convert sNaN to qNaN, if payload got truncated
data = make_nan(8, 0, False, 0x80001).to_bytes(8, byteorder)
snan_low = unpack(data, endian)
qnan4 = make_nan(4, 0, True, 0).to_bytes(4, byteorder)
qnan2 = make_nan(2, 0, True, 0).to_bytes(2, byteorder)
self.assertEqual(pack(4, snan_low, endian), qnan4)
self.assertEqual(pack(2, snan_low, endian), qnan2)
# Preserve NaN type, if payload not truncated
data = make_nan(8, 0, False, 0x80000000001).to_bytes(8, byteorder)
snan_high = unpack(data, endian)
snan4 = make_nan(4, 0, False, 16384).to_bytes(4, byteorder)
snan2 = make_nan(2, 0, False, 2).to_bytes(2, byteorder)
self.assertEqual(pack(4, snan_high, endian), snan4)
self.assertEqual(pack(2, snan_high, endian), snan2)
if __name__ == "__main__":
unittest.main()
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