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Code Issues Projects Releases Packages Wiki Activity Actions 17

Issue #24489: ensure a previously set C errno doesn't disturb cmath.polar().

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This commit is contained in:
Antoine Pitrou 2015-06-23 14:31:11 +02:00
parent 03863d2b29
commit 6bc217dd3d
4 changed files with 58 additions and 11 deletions
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51
Lib/test/test_cmath.py
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@ -1,4 +1,4 @@
from test.support import run_unittest, requires_IEEE_754
from test.support import run_unittest, requires_IEEE_754, cpython_only
from test.test_math import parse_testfile, test_file
import unittest
import cmath, math
@ -381,17 +381,48 @@ class CMathTests(unittest.TestCase):
self.rAssertAlmostEqual(expected.imag, actual.imag,
msg=error_message)
def assertCISEqual(self, a, b):
eps = 1E-7
if abs(a[0] - b[0]) > eps or abs(a[1] - b[1]) > eps:
self.fail((a ,b))
def check_polar(self, func):
def check(arg, expected):
got = func(arg)
for e, g in zip(expected, got):
self.rAssertAlmostEqual(e, g)
check(0, (0., 0.))
check(1, (1., 0.))
check(-1, (1., pi))
check(1j, (1., pi / 2))
check(-3j, (3., -pi / 2))
inf = float('inf')
check(complex(inf, 0), (inf, 0.))
check(complex(-inf, 0), (inf, pi))
check(complex(3, inf), (inf, pi / 2))
check(complex(5, -inf), (inf, -pi / 2))
check(complex(inf, inf), (inf, pi / 4))
check(complex(inf, -inf), (inf, -pi / 4))
check(complex(-inf, inf), (inf, 3 * pi / 4))
check(complex(-inf, -inf), (inf, -3 * pi / 4))
nan = float('nan')
check(complex(nan, 0), (nan, nan))
check(complex(0, nan), (nan, nan))
check(complex(nan, nan), (nan, nan))
check(complex(inf, nan), (inf, nan))
check(complex(-inf, nan), (inf, nan))
check(complex(nan, inf), (inf, nan))
check(complex(nan, -inf), (inf, nan))
def test_polar(self):
self.assertCISEqual(polar(0), (0., 0.))
self.assertCISEqual(polar(1.), (1., 0.))
self.assertCISEqual(polar(-1.), (1., pi))
self.assertCISEqual(polar(1j), (1., pi/2))
self.assertCISEqual(polar(-1j), (1., -pi/2))
self.check_polar(polar)
@cpython_only
def test_polar_errno(self):
# Issue #24489: check a previously set C errno doesn't disturb polar()
from _testcapi import set_errno
def polar_with_errno_set(z):
set_errno(11)
try:
return polar(z)
finally:
set_errno(0)
self.check_polar(polar_with_errno_set)
def test_phase(self):
self.assertAlmostEqual(phase(0), 0.)