[Jython-checkins] jython: from:
frank.wierzbicki
jython-checkins at python.org
Tue Jan 8 22:27:39 CET 2013
http://hg.python.org/jython/rev/52e305a68d7d
changeset: 6943:52e305a68d7d
user: Frank Wierzbicki <fwierzbicki at gmail.com>
date: Tue Jan 08 09:02:22 2013 -0800
summary:
from:
http://hg.python.org/cpython/Lib/test/test_float.py@22db03646d9b
files:
Lib/test/test_float.py | 1402 ++++++++++++++++++++++++++++
1 files changed, 1402 insertions(+), 0 deletions(-)
diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py
new file mode 100644
--- /dev/null
+++ b/Lib/test/test_float.py
@@ -0,0 +1,1402 @@
+
+import unittest, struct
+import os
+from test import test_support
+import math
+from math import isinf, isnan, copysign, ldexp
+import operator
+import random
+import fractions
+import sys
+
+INF = float("inf")
+NAN = float("nan")
+
+have_getformat = hasattr(float, "__getformat__")
+requires_getformat = unittest.skipUnless(have_getformat,
+ "requires __getformat__")
+requires_setformat = unittest.skipUnless(hasattr(float, "__setformat__"),
+ "requires __setformat__")
+# decorator for skipping tests on non-IEEE 754 platforms
+requires_IEEE_754 = unittest.skipUnless(have_getformat and
+ float.__getformat__("double").startswith("IEEE"),
+ "test requires IEEE 754 doubles")
+
+#locate file with float format test values
+test_dir = os.path.dirname(__file__) or os.curdir
+format_testfile = os.path.join(test_dir, 'formatfloat_testcases.txt')
+
+class GeneralFloatCases(unittest.TestCase):
+
+ def test_float(self):
+ self.assertEqual(float(3.14), 3.14)
+ self.assertEqual(float(314), 314.0)
+ self.assertEqual(float(314L), 314.0)
+ self.assertEqual(float(" 3.14 "), 3.14)
+ self.assertRaises(ValueError, float, " 0x3.1 ")
+ self.assertRaises(ValueError, float, " -0x3.p-1 ")
+ self.assertRaises(ValueError, float, " +0x3.p-1 ")
+ self.assertRaises(ValueError, float, "++3.14")
+ self.assertRaises(ValueError, float, "+-3.14")
+ self.assertRaises(ValueError, float, "-+3.14")
+ self.assertRaises(ValueError, float, "--3.14")
+ # check that we don't accept alternate exponent markers
+ self.assertRaises(ValueError, float, "-1.7d29")
+ self.assertRaises(ValueError, float, "3D-14")
+ if test_support.have_unicode:
+ self.assertEqual(float(unicode(" 3.14 ")), 3.14)
+ self.assertEqual(float(unicode(" \u0663.\u0661\u0664 ",'raw-unicode-escape')), 3.14)
+
+ # extra long strings should no longer be a problem
+ # (in 2.6, long unicode inputs to float raised ValueError)
+ float('.' + '1'*1000)
+ float(unicode('.' + '1'*1000))
+
+ def check_conversion_to_int(self, x):
+ """Check that int(x) has the correct value and type, for a float x."""
+ n = int(x)
+ if x >= 0.0:
+ # x >= 0 and n = int(x) ==> n <= x < n + 1
+ self.assertLessEqual(n, x)
+ self.assertLess(x, n + 1)
+ else:
+ # x < 0 and n = int(x) ==> n >= x > n - 1
+ self.assertGreaterEqual(n, x)
+ self.assertGreater(x, n - 1)
+
+ # Result should be an int if within range, else a long.
+ if -sys.maxint-1 <= n <= sys.maxint:
+ self.assertEqual(type(n), int)
+ else:
+ self.assertEqual(type(n), long)
+
+ # Double check.
+ self.assertEqual(type(int(n)), type(n))
+
+ def test_conversion_to_int(self):
+ # Check that floats within the range of an int convert to type
+ # int, not long. (issue #11144.)
+ boundary = float(sys.maxint + 1)
+ epsilon = 2**-sys.float_info.mant_dig * boundary
+
+ # These 2 floats are either side of the positive int/long boundary on
+ # both 32-bit and 64-bit systems.
+ self.check_conversion_to_int(boundary - epsilon)
+ self.check_conversion_to_int(boundary)
+
+ # These floats are either side of the negative long/int boundary on
+ # 64-bit systems...
+ self.check_conversion_to_int(-boundary - 2*epsilon)
+ self.check_conversion_to_int(-boundary)
+
+ # ... and these ones are either side of the negative long/int
+ # boundary on 32-bit systems.
+ self.check_conversion_to_int(-boundary - 1.0)
+ self.check_conversion_to_int(-boundary - 1.0 + 2*epsilon)
+
+ @test_support.run_with_locale('LC_NUMERIC', 'fr_FR', 'de_DE')
+ def test_float_with_comma(self):
+ # set locale to something that doesn't use '.' for the decimal point
+ # float must not accept the locale specific decimal point but
+ # it still has to accept the normal python syntax
+ import locale
+ if not locale.localeconv()['decimal_point'] == ',':
+ return
+
+ self.assertEqual(float(" 3.14 "), 3.14)
+ self.assertEqual(float("+3.14 "), 3.14)
+ self.assertEqual(float("-3.14 "), -3.14)
+ self.assertEqual(float(".14 "), .14)
+ self.assertEqual(float("3. "), 3.0)
+ self.assertEqual(float("3.e3 "), 3000.0)
+ self.assertEqual(float("3.2e3 "), 3200.0)
+ self.assertEqual(float("2.5e-1 "), 0.25)
+ self.assertEqual(float("5e-1"), 0.5)
+ self.assertRaises(ValueError, float, " 3,14 ")
+ self.assertRaises(ValueError, float, " +3,14 ")
+ self.assertRaises(ValueError, float, " -3,14 ")
+ self.assertRaises(ValueError, float, " 0x3.1 ")
+ self.assertRaises(ValueError, float, " -0x3.p-1 ")
+ self.assertRaises(ValueError, float, " +0x3.p-1 ")
+ self.assertEqual(float(" 25.e-1 "), 2.5)
+ self.assertEqual(test_support.fcmp(float(" .25e-1 "), .025), 0)
+
+ def test_floatconversion(self):
+ # Make sure that calls to __float__() work properly
+ class Foo0:
+ def __float__(self):
+ return 42.
+
+ class Foo1(object):
+ def __float__(self):
+ return 42.
+
+ class Foo2(float):
+ def __float__(self):
+ return 42.
+
+ class Foo3(float):
+ def __new__(cls, value=0.):
+ return float.__new__(cls, 2*value)
+
+ def __float__(self):
+ return self
+
+ class Foo4(float):
+ def __float__(self):
+ return 42
+
+ # Issue 5759: __float__ not called on str subclasses (though it is on
+ # unicode subclasses).
+ class FooStr(str):
+ def __float__(self):
+ return float(str(self)) + 1
+
+ class FooUnicode(unicode):
+ def __float__(self):
+ return float(unicode(self)) + 1
+
+ self.assertAlmostEqual(float(Foo0()), 42.)
+ self.assertAlmostEqual(float(Foo1()), 42.)
+ self.assertAlmostEqual(float(Foo2()), 42.)
+ self.assertAlmostEqual(float(Foo3(21)), 42.)
+ self.assertRaises(TypeError, float, Foo4(42))
+ self.assertAlmostEqual(float(FooUnicode('8')), 9.)
+ self.assertAlmostEqual(float(FooStr('8')), 9.)
+
+ def test_is_integer(self):
+ self.assertFalse((1.1).is_integer())
+ self.assertTrue((1.).is_integer())
+ self.assertFalse(float("nan").is_integer())
+ self.assertFalse(float("inf").is_integer())
+
+ def test_floatasratio(self):
+ for f, ratio in [
+ (0.875, (7, 8)),
+ (-0.875, (-7, 8)),
+ (0.0, (0, 1)),
+ (11.5, (23, 2)),
+ ]:
+ self.assertEqual(f.as_integer_ratio(), ratio)
+
+ for i in range(10000):
+ f = random.random()
+ f *= 10 ** random.randint(-100, 100)
+ n, d = f.as_integer_ratio()
+ self.assertEqual(float(n).__truediv__(d), f)
+
+ R = fractions.Fraction
+ self.assertEqual(R(0, 1),
+ R(*float(0.0).as_integer_ratio()))
+ self.assertEqual(R(5, 2),
+ R(*float(2.5).as_integer_ratio()))
+ self.assertEqual(R(1, 2),
+ R(*float(0.5).as_integer_ratio()))
+ self.assertEqual(R(4728779608739021, 2251799813685248),
+ R(*float(2.1).as_integer_ratio()))
+ self.assertEqual(R(-4728779608739021, 2251799813685248),
+ R(*float(-2.1).as_integer_ratio()))
+ self.assertEqual(R(-2100, 1),
+ R(*float(-2100.0).as_integer_ratio()))
+
+ self.assertRaises(OverflowError, float('inf').as_integer_ratio)
+ self.assertRaises(OverflowError, float('-inf').as_integer_ratio)
+ self.assertRaises(ValueError, float('nan').as_integer_ratio)
+
+ def assertEqualAndEqualSign(self, a, b):
+ # fail unless a == b and a and b have the same sign bit;
+ # the only difference from assertEqual is that this test
+ # distinguishes -0.0 and 0.0.
+ self.assertEqual((a, copysign(1.0, a)), (b, copysign(1.0, b)))
+
+ @requires_IEEE_754
+ def test_float_mod(self):
+ # Check behaviour of % operator for IEEE 754 special cases.
+ # In particular, check signs of zeros.
+ mod = operator.mod
+
+ self.assertEqualAndEqualSign(mod(-1.0, 1.0), 0.0)
+ self.assertEqualAndEqualSign(mod(-1e-100, 1.0), 1.0)
+ self.assertEqualAndEqualSign(mod(-0.0, 1.0), 0.0)
+ self.assertEqualAndEqualSign(mod(0.0, 1.0), 0.0)
+ self.assertEqualAndEqualSign(mod(1e-100, 1.0), 1e-100)
+ self.assertEqualAndEqualSign(mod(1.0, 1.0), 0.0)
+
+ self.assertEqualAndEqualSign(mod(-1.0, -1.0), -0.0)
+ self.assertEqualAndEqualSign(mod(-1e-100, -1.0), -1e-100)
+ self.assertEqualAndEqualSign(mod(-0.0, -1.0), -0.0)
+ self.assertEqualAndEqualSign(mod(0.0, -1.0), -0.0)
+ self.assertEqualAndEqualSign(mod(1e-100, -1.0), -1.0)
+ self.assertEqualAndEqualSign(mod(1.0, -1.0), -0.0)
+
+ @requires_IEEE_754
+ def test_float_pow(self):
+ # test builtin pow and ** operator for IEEE 754 special cases.
+ # Special cases taken from section F.9.4.4 of the C99 specification
+
+ for pow_op in pow, operator.pow:
+ # x**NAN is NAN for any x except 1
+ self.assertTrue(isnan(pow_op(-INF, NAN)))
+ self.assertTrue(isnan(pow_op(-2.0, NAN)))
+ self.assertTrue(isnan(pow_op(-1.0, NAN)))
+ self.assertTrue(isnan(pow_op(-0.5, NAN)))
+ self.assertTrue(isnan(pow_op(-0.0, NAN)))
+ self.assertTrue(isnan(pow_op(0.0, NAN)))
+ self.assertTrue(isnan(pow_op(0.5, NAN)))
+ self.assertTrue(isnan(pow_op(2.0, NAN)))
+ self.assertTrue(isnan(pow_op(INF, NAN)))
+ self.assertTrue(isnan(pow_op(NAN, NAN)))
+
+ # NAN**y is NAN for any y except +-0
+ self.assertTrue(isnan(pow_op(NAN, -INF)))
+ self.assertTrue(isnan(pow_op(NAN, -2.0)))
+ self.assertTrue(isnan(pow_op(NAN, -1.0)))
+ self.assertTrue(isnan(pow_op(NAN, -0.5)))
+ self.assertTrue(isnan(pow_op(NAN, 0.5)))
+ self.assertTrue(isnan(pow_op(NAN, 1.0)))
+ self.assertTrue(isnan(pow_op(NAN, 2.0)))
+ self.assertTrue(isnan(pow_op(NAN, INF)))
+
+ # (+-0)**y raises ZeroDivisionError for y a negative odd integer
+ self.assertRaises(ZeroDivisionError, pow_op, -0.0, -1.0)
+ self.assertRaises(ZeroDivisionError, pow_op, 0.0, -1.0)
+
+ # (+-0)**y raises ZeroDivisionError for y finite and negative
+ # but not an odd integer
+ self.assertRaises(ZeroDivisionError, pow_op, -0.0, -2.0)
+ self.assertRaises(ZeroDivisionError, pow_op, -0.0, -0.5)
+ self.assertRaises(ZeroDivisionError, pow_op, 0.0, -2.0)
+ self.assertRaises(ZeroDivisionError, pow_op, 0.0, -0.5)
+
+ # (+-0)**y is +-0 for y a positive odd integer
+ self.assertEqualAndEqualSign(pow_op(-0.0, 1.0), -0.0)
+ self.assertEqualAndEqualSign(pow_op(0.0, 1.0), 0.0)
+
+ # (+-0)**y is 0 for y finite and positive but not an odd integer
+ self.assertEqualAndEqualSign(pow_op(-0.0, 0.5), 0.0)
+ self.assertEqualAndEqualSign(pow_op(-0.0, 2.0), 0.0)
+ self.assertEqualAndEqualSign(pow_op(0.0, 0.5), 0.0)
+ self.assertEqualAndEqualSign(pow_op(0.0, 2.0), 0.0)
+
+ # (-1)**+-inf is 1
+ self.assertEqualAndEqualSign(pow_op(-1.0, -INF), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-1.0, INF), 1.0)
+
+ # 1**y is 1 for any y, even if y is an infinity or nan
+ self.assertEqualAndEqualSign(pow_op(1.0, -INF), 1.0)
+ self.assertEqualAndEqualSign(pow_op(1.0, -2.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(1.0, -1.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(1.0, -0.5), 1.0)
+ self.assertEqualAndEqualSign(pow_op(1.0, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(1.0, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(1.0, 0.5), 1.0)
+ self.assertEqualAndEqualSign(pow_op(1.0, 1.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(1.0, 2.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(1.0, INF), 1.0)
+ self.assertEqualAndEqualSign(pow_op(1.0, NAN), 1.0)
+
+ # x**+-0 is 1 for any x, even if x is a zero, infinity, or nan
+ self.assertEqualAndEqualSign(pow_op(-INF, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-2.0, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-1.0, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-0.5, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-0.0, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(0.0, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(0.5, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(1.0, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(2.0, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(INF, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(NAN, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-INF, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-2.0, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-1.0, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-0.5, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-0.0, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(0.0, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(0.5, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(1.0, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(2.0, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(INF, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(NAN, -0.0), 1.0)
+
+ # x**y raises ValueError for finite negative x and non-integral y
+ self.assertRaises(ValueError, pow_op, -2.0, -0.5)
+ self.assertRaises(ValueError, pow_op, -2.0, 0.5)
+ self.assertRaises(ValueError, pow_op, -1.0, -0.5)
+ self.assertRaises(ValueError, pow_op, -1.0, 0.5)
+ self.assertRaises(ValueError, pow_op, -0.5, -0.5)
+ self.assertRaises(ValueError, pow_op, -0.5, 0.5)
+
+ # x**-INF is INF for abs(x) < 1
+ self.assertEqualAndEqualSign(pow_op(-0.5, -INF), INF)
+ self.assertEqualAndEqualSign(pow_op(-0.0, -INF), INF)
+ self.assertEqualAndEqualSign(pow_op(0.0, -INF), INF)
+ self.assertEqualAndEqualSign(pow_op(0.5, -INF), INF)
+
+ # x**-INF is 0 for abs(x) > 1
+ self.assertEqualAndEqualSign(pow_op(-INF, -INF), 0.0)
+ self.assertEqualAndEqualSign(pow_op(-2.0, -INF), 0.0)
+ self.assertEqualAndEqualSign(pow_op(2.0, -INF), 0.0)
+ self.assertEqualAndEqualSign(pow_op(INF, -INF), 0.0)
+
+ # x**INF is 0 for abs(x) < 1
+ self.assertEqualAndEqualSign(pow_op(-0.5, INF), 0.0)
+ self.assertEqualAndEqualSign(pow_op(-0.0, INF), 0.0)
+ self.assertEqualAndEqualSign(pow_op(0.0, INF), 0.0)
+ self.assertEqualAndEqualSign(pow_op(0.5, INF), 0.0)
+
+ # x**INF is INF for abs(x) > 1
+ self.assertEqualAndEqualSign(pow_op(-INF, INF), INF)
+ self.assertEqualAndEqualSign(pow_op(-2.0, INF), INF)
+ self.assertEqualAndEqualSign(pow_op(2.0, INF), INF)
+ self.assertEqualAndEqualSign(pow_op(INF, INF), INF)
+
+ # (-INF)**y is -0.0 for y a negative odd integer
+ self.assertEqualAndEqualSign(pow_op(-INF, -1.0), -0.0)
+
+ # (-INF)**y is 0.0 for y negative but not an odd integer
+ self.assertEqualAndEqualSign(pow_op(-INF, -0.5), 0.0)
+ self.assertEqualAndEqualSign(pow_op(-INF, -2.0), 0.0)
+
+ # (-INF)**y is -INF for y a positive odd integer
+ self.assertEqualAndEqualSign(pow_op(-INF, 1.0), -INF)
+
+ # (-INF)**y is INF for y positive but not an odd integer
+ self.assertEqualAndEqualSign(pow_op(-INF, 0.5), INF)
+ self.assertEqualAndEqualSign(pow_op(-INF, 2.0), INF)
+
+ # INF**y is INF for y positive
+ self.assertEqualAndEqualSign(pow_op(INF, 0.5), INF)
+ self.assertEqualAndEqualSign(pow_op(INF, 1.0), INF)
+ self.assertEqualAndEqualSign(pow_op(INF, 2.0), INF)
+
+ # INF**y is 0.0 for y negative
+ self.assertEqualAndEqualSign(pow_op(INF, -2.0), 0.0)
+ self.assertEqualAndEqualSign(pow_op(INF, -1.0), 0.0)
+ self.assertEqualAndEqualSign(pow_op(INF, -0.5), 0.0)
+
+ # basic checks not covered by the special cases above
+ self.assertEqualAndEqualSign(pow_op(-2.0, -2.0), 0.25)
+ self.assertEqualAndEqualSign(pow_op(-2.0, -1.0), -0.5)
+ self.assertEqualAndEqualSign(pow_op(-2.0, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-2.0, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-2.0, 1.0), -2.0)
+ self.assertEqualAndEqualSign(pow_op(-2.0, 2.0), 4.0)
+ self.assertEqualAndEqualSign(pow_op(-1.0, -2.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-1.0, -1.0), -1.0)
+ self.assertEqualAndEqualSign(pow_op(-1.0, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-1.0, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-1.0, 1.0), -1.0)
+ self.assertEqualAndEqualSign(pow_op(-1.0, 2.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(2.0, -2.0), 0.25)
+ self.assertEqualAndEqualSign(pow_op(2.0, -1.0), 0.5)
+ self.assertEqualAndEqualSign(pow_op(2.0, -0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(2.0, 0.0), 1.0)
+ self.assertEqualAndEqualSign(pow_op(2.0, 1.0), 2.0)
+ self.assertEqualAndEqualSign(pow_op(2.0, 2.0), 4.0)
+
+ # 1 ** large and -1 ** large; some libms apparently
+ # have problems with these
+ self.assertEqualAndEqualSign(pow_op(1.0, -1e100), 1.0)
+ self.assertEqualAndEqualSign(pow_op(1.0, 1e100), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-1.0, -1e100), 1.0)
+ self.assertEqualAndEqualSign(pow_op(-1.0, 1e100), 1.0)
+
+ # check sign for results that underflow to 0
+ self.assertEqualAndEqualSign(pow_op(-2.0, -2000.0), 0.0)
+ self.assertRaises(ValueError, pow_op, -2.0, -2000.5)
+ self.assertEqualAndEqualSign(pow_op(-2.0, -2001.0), -0.0)
+ self.assertEqualAndEqualSign(pow_op(2.0, -2000.0), 0.0)
+ self.assertEqualAndEqualSign(pow_op(2.0, -2000.5), 0.0)
+ self.assertEqualAndEqualSign(pow_op(2.0, -2001.0), 0.0)
+ self.assertEqualAndEqualSign(pow_op(-0.5, 2000.0), 0.0)
+ self.assertRaises(ValueError, pow_op, -0.5, 2000.5)
+ self.assertEqualAndEqualSign(pow_op(-0.5, 2001.0), -0.0)
+ self.assertEqualAndEqualSign(pow_op(0.5, 2000.0), 0.0)
+ self.assertEqualAndEqualSign(pow_op(0.5, 2000.5), 0.0)
+ self.assertEqualAndEqualSign(pow_op(0.5, 2001.0), 0.0)
+
+ # check we don't raise an exception for subnormal results,
+ # and validate signs. Tests currently disabled, since
+ # they fail on systems where a subnormal result from pow
+ # is flushed to zero (e.g. Debian/ia64.)
+ #self.assertTrue(0.0 < pow_op(0.5, 1048) < 1e-315)
+ #self.assertTrue(0.0 < pow_op(-0.5, 1048) < 1e-315)
+ #self.assertTrue(0.0 < pow_op(0.5, 1047) < 1e-315)
+ #self.assertTrue(0.0 > pow_op(-0.5, 1047) > -1e-315)
+ #self.assertTrue(0.0 < pow_op(2.0, -1048) < 1e-315)
+ #self.assertTrue(0.0 < pow_op(-2.0, -1048) < 1e-315)
+ #self.assertTrue(0.0 < pow_op(2.0, -1047) < 1e-315)
+ #self.assertTrue(0.0 > pow_op(-2.0, -1047) > -1e-315)
+
+
+ at requires_setformat
+class FormatFunctionsTestCase(unittest.TestCase):
+
+ def setUp(self):
+ self.save_formats = {'double':float.__getformat__('double'),
+ 'float':float.__getformat__('float')}
+
+ def tearDown(self):
+ float.__setformat__('double', self.save_formats['double'])
+ float.__setformat__('float', self.save_formats['float'])
+
+ def test_getformat(self):
+ self.assertIn(float.__getformat__('double'),
+ ['unknown', 'IEEE, big-endian', 'IEEE, little-endian'])
+ self.assertIn(float.__getformat__('float'),
+ ['unknown', 'IEEE, big-endian', 'IEEE, little-endian'])
+ self.assertRaises(ValueError, float.__getformat__, 'chicken')
+ self.assertRaises(TypeError, float.__getformat__, 1)
+
+ def test_setformat(self):
+ for t in 'double', 'float':
+ float.__setformat__(t, 'unknown')
+ if self.save_formats[t] == 'IEEE, big-endian':
+ self.assertRaises(ValueError, float.__setformat__,
+ t, 'IEEE, little-endian')
+ elif self.save_formats[t] == 'IEEE, little-endian':
+ self.assertRaises(ValueError, float.__setformat__,
+ t, 'IEEE, big-endian')
+ else:
+ self.assertRaises(ValueError, float.__setformat__,
+ t, 'IEEE, big-endian')
+ self.assertRaises(ValueError, float.__setformat__,
+ t, 'IEEE, little-endian')
+ self.assertRaises(ValueError, float.__setformat__,
+ t, 'chicken')
+ self.assertRaises(ValueError, float.__setformat__,
+ 'chicken', 'unknown')
+
+BE_DOUBLE_INF = '\x7f\xf0\x00\x00\x00\x00\x00\x00'
+LE_DOUBLE_INF = ''.join(reversed(BE_DOUBLE_INF))
+BE_DOUBLE_NAN = '\x7f\xf8\x00\x00\x00\x00\x00\x00'
+LE_DOUBLE_NAN = ''.join(reversed(BE_DOUBLE_NAN))
+
+BE_FLOAT_INF = '\x7f\x80\x00\x00'
+LE_FLOAT_INF = ''.join(reversed(BE_FLOAT_INF))
+BE_FLOAT_NAN = '\x7f\xc0\x00\x00'
+LE_FLOAT_NAN = ''.join(reversed(BE_FLOAT_NAN))
+
+# on non-IEEE platforms, attempting to unpack a bit pattern
+# representing an infinity or a NaN should raise an exception.
+
+ at requires_setformat
+class UnknownFormatTestCase(unittest.TestCase):
+ def setUp(self):
+ self.save_formats = {'double':float.__getformat__('double'),
+ 'float':float.__getformat__('float')}
+ float.__setformat__('double', 'unknown')
+ float.__setformat__('float', 'unknown')
+
+ def tearDown(self):
+ float.__setformat__('double', self.save_formats['double'])
+ float.__setformat__('float', self.save_formats['float'])
+
+ def test_double_specials_dont_unpack(self):
+ for fmt, data in [('>d', BE_DOUBLE_INF),
+ ('>d', BE_DOUBLE_NAN),
+ ('<d', LE_DOUBLE_INF),
+ ('<d', LE_DOUBLE_NAN)]:
+ self.assertRaises(ValueError, struct.unpack, fmt, data)
+
+ def test_float_specials_dont_unpack(self):
+ for fmt, data in [('>f', BE_FLOAT_INF),
+ ('>f', BE_FLOAT_NAN),
+ ('<f', LE_FLOAT_INF),
+ ('<f', LE_FLOAT_NAN)]:
+ self.assertRaises(ValueError, struct.unpack, fmt, data)
+
+
+# on an IEEE platform, all we guarantee is that bit patterns
+# representing infinities or NaNs do not raise an exception; all else
+# is accident (today).
+# let's also try to guarantee that -0.0 and 0.0 don't get confused.
+
+class IEEEFormatTestCase(unittest.TestCase):
+
+ @requires_IEEE_754
+ def test_double_specials_do_unpack(self):
+ for fmt, data in [('>d', BE_DOUBLE_INF),
+ ('>d', BE_DOUBLE_NAN),
+ ('<d', LE_DOUBLE_INF),
+ ('<d', LE_DOUBLE_NAN)]:
+ struct.unpack(fmt, data)
+
+ @requires_IEEE_754
+ def test_float_specials_do_unpack(self):
+ for fmt, data in [('>f', BE_FLOAT_INF),
+ ('>f', BE_FLOAT_NAN),
+ ('<f', LE_FLOAT_INF),
+ ('<f', LE_FLOAT_NAN)]:
+ struct.unpack(fmt, data)
+
+ @requires_IEEE_754
+ def test_negative_zero(self):
+ def pos_pos():
+ return 0.0, math.atan2(0.0, -1)
+ def pos_neg():
+ return 0.0, math.atan2(-0.0, -1)
+ def neg_pos():
+ return -0.0, math.atan2(0.0, -1)
+ def neg_neg():
+ return -0.0, math.atan2(-0.0, -1)
+ self.assertEqual(pos_pos(), neg_pos())
+ self.assertEqual(pos_neg(), neg_neg())
+
+ @requires_IEEE_754
+ def test_underflow_sign(self):
+ # check that -1e-1000 gives -0.0, not 0.0
+ self.assertEqual(math.atan2(-1e-1000, -1), math.atan2(-0.0, -1))
+ self.assertEqual(math.atan2(float('-1e-1000'), -1),
+ math.atan2(-0.0, -1))
+
+ def test_format(self):
+ # these should be rewritten to use both format(x, spec) and
+ # x.__format__(spec)
+
+ self.assertEqual(format(0.0, 'f'), '0.000000')
+
+ # the default is 'g', except for empty format spec
+ self.assertEqual(format(0.0, ''), '0.0')
+ self.assertEqual(format(0.01, ''), '0.01')
+ self.assertEqual(format(0.01, 'g'), '0.01')
+
+ # empty presentation type should format in the same way as str
+ # (issue 5920)
+ x = 100/7.
+ self.assertEqual(format(x, ''), str(x))
+ self.assertEqual(format(x, '-'), str(x))
+ self.assertEqual(format(x, '>'), str(x))
+ self.assertEqual(format(x, '2'), str(x))
+
+ self.assertEqual(format(1.0, 'f'), '1.000000')
+
+ self.assertEqual(format(-1.0, 'f'), '-1.000000')
+
+ self.assertEqual(format( 1.0, ' f'), ' 1.000000')
+ self.assertEqual(format(-1.0, ' f'), '-1.000000')
+ self.assertEqual(format( 1.0, '+f'), '+1.000000')
+ self.assertEqual(format(-1.0, '+f'), '-1.000000')
+
+ # % formatting
+ self.assertEqual(format(-1.0, '%'), '-100.000000%')
+
+ # conversion to string should fail
+ self.assertRaises(ValueError, format, 3.0, "s")
+
+ # other format specifiers shouldn't work on floats,
+ # in particular int specifiers
+ for format_spec in ([chr(x) for x in range(ord('a'), ord('z')+1)] +
+ [chr(x) for x in range(ord('A'), ord('Z')+1)]):
+ if not format_spec in 'eEfFgGn%':
+ self.assertRaises(ValueError, format, 0.0, format_spec)
+ self.assertRaises(ValueError, format, 1.0, format_spec)
+ self.assertRaises(ValueError, format, -1.0, format_spec)
+ self.assertRaises(ValueError, format, 1e100, format_spec)
+ self.assertRaises(ValueError, format, -1e100, format_spec)
+ self.assertRaises(ValueError, format, 1e-100, format_spec)
+ self.assertRaises(ValueError, format, -1e-100, format_spec)
+
+ # issue 3382: 'f' and 'F' with inf's and nan's
+ self.assertEqual('{0:f}'.format(INF), 'inf')
+ self.assertEqual('{0:F}'.format(INF), 'INF')
+ self.assertEqual('{0:f}'.format(-INF), '-inf')
+ self.assertEqual('{0:F}'.format(-INF), '-INF')
+ self.assertEqual('{0:f}'.format(NAN), 'nan')
+ self.assertEqual('{0:F}'.format(NAN), 'NAN')
+
+ @requires_IEEE_754
+ def test_format_testfile(self):
+ with open(format_testfile) as testfile:
+ for line in open(format_testfile):
+ if line.startswith('--'):
+ continue
+ line = line.strip()
+ if not line:
+ continue
+
+ lhs, rhs = map(str.strip, line.split('->'))
+ fmt, arg = lhs.split()
+ arg = float(arg)
+ self.assertEqual(fmt % arg, rhs)
+ if not math.isnan(arg) and copysign(1.0, arg) > 0.0:
+ self.assertEqual(fmt % -arg, '-' + rhs)
+
+ def test_issue5864(self):
+ self.assertEqual(format(123.456, '.4'), '123.5')
+ self.assertEqual(format(1234.56, '.4'), '1.235e+03')
+ self.assertEqual(format(12345.6, '.4'), '1.235e+04')
+
+class ReprTestCase(unittest.TestCase):
+ def test_repr(self):
+ floats_file = open(os.path.join(os.path.split(__file__)[0],
+ 'floating_points.txt'))
+ for line in floats_file:
+ line = line.strip()
+ if not line or line.startswith('#'):
+ continue
+ v = eval(line)
+ self.assertEqual(v, eval(repr(v)))
+ floats_file.close()
+
+ @unittest.skipUnless(getattr(sys, 'float_repr_style', '') == 'short',
+ "applies only when using short float repr style")
+ def test_short_repr(self):
+ # test short float repr introduced in Python 3.1. One aspect
+ # of this repr is that we get some degree of str -> float ->
+ # str roundtripping. In particular, for any numeric string
+ # containing 15 or fewer significant digits, those exact same
+ # digits (modulo trailing zeros) should appear in the output.
+ # No more repr(0.03) -> "0.029999999999999999"!
+
+ test_strings = [
+ # output always includes *either* a decimal point and at
+ # least one digit after that point, or an exponent.
+ '0.0',
+ '1.0',
+ '0.01',
+ '0.02',
+ '0.03',
+ '0.04',
+ '0.05',
+ '1.23456789',
+ '10.0',
+ '100.0',
+ # values >= 1e16 get an exponent...
+ '1000000000000000.0',
+ '9999999999999990.0',
+ '1e+16',
+ '1e+17',
+ # ... and so do values < 1e-4
+ '0.001',
+ '0.001001',
+ '0.00010000000000001',
+ '0.0001',
+ '9.999999999999e-05',
+ '1e-05',
+ # values designed to provoke failure if the FPU rounding
+ # precision isn't set correctly
+ '8.72293771110361e+25',
+ '7.47005307342313e+26',
+ '2.86438000439698e+28',
+ '8.89142905246179e+28',
+ '3.08578087079232e+35',
+ ]
+
+ for s in test_strings:
+ negs = '-'+s
+ self.assertEqual(s, repr(float(s)))
+ self.assertEqual(negs, repr(float(negs)))
+
+
+ at requires_IEEE_754
+class RoundTestCase(unittest.TestCase):
+ def test_second_argument_type(self):
+ # any type with an __index__ method should be permitted as
+ # a second argument
+ self.assertAlmostEqual(round(12.34, True), 12.3)
+
+ class MyIndex(object):
+ def __index__(self): return 4
+ self.assertAlmostEqual(round(-0.123456, MyIndex()), -0.1235)
+ # but floats should be illegal
+ self.assertRaises(TypeError, round, 3.14159, 2.0)
+
+ def test_inf_nan(self):
+ # rounding an infinity or nan returns the same number;
+ # (in py3k, rounding an infinity or nan raises an error,
+ # since the result can't be represented as a long).
+ self.assertEqual(round(INF), INF)
+ self.assertEqual(round(-INF), -INF)
+ self.assertTrue(math.isnan(round(NAN)))
+ for n in range(-5, 5):
+ self.assertEqual(round(INF, n), INF)
+ self.assertEqual(round(-INF, n), -INF)
+ self.assertTrue(math.isnan(round(NAN, n)))
+
+ self.assertRaises(TypeError, round, INF, 0.0)
+ self.assertRaises(TypeError, round, -INF, 1.0)
+ self.assertRaises(TypeError, round, NAN, "ceci n'est pas un integer")
+ self.assertRaises(TypeError, round, -0.0, 1j)
+
+ def test_large_n(self):
+ for n in [324, 325, 400, 2**31-1, 2**31, 2**32, 2**100]:
+ self.assertEqual(round(123.456, n), 123.456)
+ self.assertEqual(round(-123.456, n), -123.456)
+ self.assertEqual(round(1e300, n), 1e300)
+ self.assertEqual(round(1e-320, n), 1e-320)
+ self.assertEqual(round(1e150, 300), 1e150)
+ self.assertEqual(round(1e300, 307), 1e300)
+ self.assertEqual(round(-3.1415, 308), -3.1415)
+ self.assertEqual(round(1e150, 309), 1e150)
+ self.assertEqual(round(1.4e-315, 315), 1e-315)
+
+ def test_small_n(self):
+ for n in [-308, -309, -400, 1-2**31, -2**31, -2**31-1, -2**100]:
+ self.assertEqual(round(123.456, n), 0.0)
+ self.assertEqual(round(-123.456, n), -0.0)
+ self.assertEqual(round(1e300, n), 0.0)
+ self.assertEqual(round(1e-320, n), 0.0)
+
+ def test_overflow(self):
+ self.assertRaises(OverflowError, round, 1.6e308, -308)
+ self.assertRaises(OverflowError, round, -1.7e308, -308)
+
+ @unittest.skipUnless(getattr(sys, 'float_repr_style', '') == 'short',
+ "test applies only when using short float repr style")
+ def test_previous_round_bugs(self):
+ # particular cases that have occurred in bug reports
+ self.assertEqual(round(562949953421312.5, 1),
+ 562949953421312.5)
+ self.assertEqual(round(56294995342131.5, 3),
+ 56294995342131.5)
+
+ @unittest.skipUnless(getattr(sys, 'float_repr_style', '') == 'short',
+ "test applies only when using short float repr style")
+ def test_halfway_cases(self):
+ # Halfway cases need special attention, since the current
+ # implementation has to deal with them specially. Note that
+ # 2.x rounds halfway values up (i.e., away from zero) while
+ # 3.x does round-half-to-even.
+ self.assertAlmostEqual(round(0.125, 2), 0.13)
+ self.assertAlmostEqual(round(0.375, 2), 0.38)
+ self.assertAlmostEqual(round(0.625, 2), 0.63)
+ self.assertAlmostEqual(round(0.875, 2), 0.88)
+ self.assertAlmostEqual(round(-0.125, 2), -0.13)
+ self.assertAlmostEqual(round(-0.375, 2), -0.38)
+ self.assertAlmostEqual(round(-0.625, 2), -0.63)
+ self.assertAlmostEqual(round(-0.875, 2), -0.88)
+
+ self.assertAlmostEqual(round(0.25, 1), 0.3)
+ self.assertAlmostEqual(round(0.75, 1), 0.8)
+ self.assertAlmostEqual(round(-0.25, 1), -0.3)
+ self.assertAlmostEqual(round(-0.75, 1), -0.8)
+
+ self.assertEqual(round(-6.5, 0), -7.0)
+ self.assertEqual(round(-5.5, 0), -6.0)
+ self.assertEqual(round(-1.5, 0), -2.0)
+ self.assertEqual(round(-0.5, 0), -1.0)
+ self.assertEqual(round(0.5, 0), 1.0)
+ self.assertEqual(round(1.5, 0), 2.0)
+ self.assertEqual(round(2.5, 0), 3.0)
+ self.assertEqual(round(3.5, 0), 4.0)
+ self.assertEqual(round(4.5, 0), 5.0)
+ self.assertEqual(round(5.5, 0), 6.0)
+ self.assertEqual(round(6.5, 0), 7.0)
+
+ # same but without an explicit second argument; in 3.x these
+ # will give integers
+ self.assertEqual(round(-6.5), -7.0)
+ self.assertEqual(round(-5.5), -6.0)
+ self.assertEqual(round(-1.5), -2.0)
+ self.assertEqual(round(-0.5), -1.0)
+ self.assertEqual(round(0.5), 1.0)
+ self.assertEqual(round(1.5), 2.0)
+ self.assertEqual(round(2.5), 3.0)
+ self.assertEqual(round(3.5), 4.0)
+ self.assertEqual(round(4.5), 5.0)
+ self.assertEqual(round(5.5), 6.0)
+ self.assertEqual(round(6.5), 7.0)
+
+ self.assertEqual(round(-25.0, -1), -30.0)
+ self.assertEqual(round(-15.0, -1), -20.0)
+ self.assertEqual(round(-5.0, -1), -10.0)
+ self.assertEqual(round(5.0, -1), 10.0)
+ self.assertEqual(round(15.0, -1), 20.0)
+ self.assertEqual(round(25.0, -1), 30.0)
+ self.assertEqual(round(35.0, -1), 40.0)
+ self.assertEqual(round(45.0, -1), 50.0)
+ self.assertEqual(round(55.0, -1), 60.0)
+ self.assertEqual(round(65.0, -1), 70.0)
+ self.assertEqual(round(75.0, -1), 80.0)
+ self.assertEqual(round(85.0, -1), 90.0)
+ self.assertEqual(round(95.0, -1), 100.0)
+ self.assertEqual(round(12325.0, -1), 12330.0)
+
+ self.assertEqual(round(350.0, -2), 400.0)
+ self.assertEqual(round(450.0, -2), 500.0)
+
+ self.assertAlmostEqual(round(0.5e21, -21), 1e21)
+ self.assertAlmostEqual(round(1.5e21, -21), 2e21)
+ self.assertAlmostEqual(round(2.5e21, -21), 3e21)
+ self.assertAlmostEqual(round(5.5e21, -21), 6e21)
+ self.assertAlmostEqual(round(8.5e21, -21), 9e21)
+
+ self.assertAlmostEqual(round(-1.5e22, -22), -2e22)
+ self.assertAlmostEqual(round(-0.5e22, -22), -1e22)
+ self.assertAlmostEqual(round(0.5e22, -22), 1e22)
+ self.assertAlmostEqual(round(1.5e22, -22), 2e22)
+
+
+ @requires_IEEE_754
+ def test_format_specials(self):
+ # Test formatting of nans and infs.
+
+ def test(fmt, value, expected):
+ # Test with both % and format().
+ self.assertEqual(fmt % value, expected, fmt)
+ if not '#' in fmt:
+ # Until issue 7094 is implemented, format() for floats doesn't
+ # support '#' formatting
+ fmt = fmt[1:] # strip off the %
+ self.assertEqual(format(value, fmt), expected, fmt)
+
+ for fmt in ['%e', '%f', '%g', '%.0e', '%.6f', '%.20g',
+ '%#e', '%#f', '%#g', '%#.20e', '%#.15f', '%#.3g']:
+ pfmt = '%+' + fmt[1:]
+ sfmt = '% ' + fmt[1:]
+ test(fmt, INF, 'inf')
+ test(fmt, -INF, '-inf')
+ test(fmt, NAN, 'nan')
+ test(fmt, -NAN, 'nan')
+ # When asking for a sign, it's always provided. nans are
+ # always positive.
+ test(pfmt, INF, '+inf')
+ test(pfmt, -INF, '-inf')
+ test(pfmt, NAN, '+nan')
+ test(pfmt, -NAN, '+nan')
+ # When using ' ' for a sign code, only infs can be negative.
+ # Others have a space.
+ test(sfmt, INF, ' inf')
+ test(sfmt, -INF, '-inf')
+ test(sfmt, NAN, ' nan')
+ test(sfmt, -NAN, ' nan')
+
+
+# Beginning with Python 2.6 float has cross platform compatible
+# ways to create and represent inf and nan
+class InfNanTest(unittest.TestCase):
+ def test_inf_from_str(self):
+ self.assertTrue(isinf(float("inf")))
+ self.assertTrue(isinf(float("+inf")))
+ self.assertTrue(isinf(float("-inf")))
+ self.assertTrue(isinf(float("infinity")))
+ self.assertTrue(isinf(float("+infinity")))
+ self.assertTrue(isinf(float("-infinity")))
+
+ self.assertEqual(repr(float("inf")), "inf")
+ self.assertEqual(repr(float("+inf")), "inf")
+ self.assertEqual(repr(float("-inf")), "-inf")
+ self.assertEqual(repr(float("infinity")), "inf")
+ self.assertEqual(repr(float("+infinity")), "inf")
+ self.assertEqual(repr(float("-infinity")), "-inf")
+
+ self.assertEqual(repr(float("INF")), "inf")
+ self.assertEqual(repr(float("+Inf")), "inf")
+ self.assertEqual(repr(float("-iNF")), "-inf")
+ self.assertEqual(repr(float("Infinity")), "inf")
+ self.assertEqual(repr(float("+iNfInItY")), "inf")
+ self.assertEqual(repr(float("-INFINITY")), "-inf")
+
+ self.assertEqual(str(float("inf")), "inf")
+ self.assertEqual(str(float("+inf")), "inf")
+ self.assertEqual(str(float("-inf")), "-inf")
+ self.assertEqual(str(float("infinity")), "inf")
+ self.assertEqual(str(float("+infinity")), "inf")
+ self.assertEqual(str(float("-infinity")), "-inf")
+
+ self.assertRaises(ValueError, float, "info")
+ self.assertRaises(ValueError, float, "+info")
+ self.assertRaises(ValueError, float, "-info")
+ self.assertRaises(ValueError, float, "in")
+ self.assertRaises(ValueError, float, "+in")
+ self.assertRaises(ValueError, float, "-in")
+ self.assertRaises(ValueError, float, "infinit")
+ self.assertRaises(ValueError, float, "+Infin")
+ self.assertRaises(ValueError, float, "-INFI")
+ self.assertRaises(ValueError, float, "infinitys")
+
+ def test_inf_as_str(self):
+ self.assertEqual(repr(1e300 * 1e300), "inf")
+ self.assertEqual(repr(-1e300 * 1e300), "-inf")
+
+ self.assertEqual(str(1e300 * 1e300), "inf")
+ self.assertEqual(str(-1e300 * 1e300), "-inf")
+
+ def test_nan_from_str(self):
+ self.assertTrue(isnan(float("nan")))
+ self.assertTrue(isnan(float("+nan")))
+ self.assertTrue(isnan(float("-nan")))
+
+ self.assertEqual(repr(float("nan")), "nan")
+ self.assertEqual(repr(float("+nan")), "nan")
+ self.assertEqual(repr(float("-nan")), "nan")
+
+ self.assertEqual(repr(float("NAN")), "nan")
+ self.assertEqual(repr(float("+NAn")), "nan")
+ self.assertEqual(repr(float("-NaN")), "nan")
+
+ self.assertEqual(str(float("nan")), "nan")
+ self.assertEqual(str(float("+nan")), "nan")
+ self.assertEqual(str(float("-nan")), "nan")
+
+ self.assertRaises(ValueError, float, "nana")
+ self.assertRaises(ValueError, float, "+nana")
+ self.assertRaises(ValueError, float, "-nana")
+ self.assertRaises(ValueError, float, "na")
+ self.assertRaises(ValueError, float, "+na")
+ self.assertRaises(ValueError, float, "-na")
+
+ def test_nan_as_str(self):
+ self.assertEqual(repr(1e300 * 1e300 * 0), "nan")
+ self.assertEqual(repr(-1e300 * 1e300 * 0), "nan")
+
+ self.assertEqual(str(1e300 * 1e300 * 0), "nan")
+ self.assertEqual(str(-1e300 * 1e300 * 0), "nan")
+
+ def notest_float_nan(self):
+ self.assertTrue(NAN.is_nan())
+ self.assertFalse(INF.is_nan())
+ self.assertFalse((0.).is_nan())
+
+ def notest_float_inf(self):
+ self.assertTrue(INF.is_inf())
+ self.assertFalse(NAN.is_inf())
+ self.assertFalse((0.).is_inf())
+
+ def test_hash_inf(self):
+ # the actual values here should be regarded as an
+ # implementation detail, but they need to be
+ # identical to those used in the Decimal module.
+ self.assertEqual(hash(float('inf')), 314159)
+ self.assertEqual(hash(float('-inf')), -271828)
+ self.assertEqual(hash(float('nan')), 0)
+
+
+fromHex = float.fromhex
+toHex = float.hex
+class HexFloatTestCase(unittest.TestCase):
+ MAX = fromHex('0x.fffffffffffff8p+1024') # max normal
+ MIN = fromHex('0x1p-1022') # min normal
+ TINY = fromHex('0x0.0000000000001p-1022') # min subnormal
+ EPS = fromHex('0x0.0000000000001p0') # diff between 1.0 and next float up
+
+ def identical(self, x, y):
+ # check that floats x and y are identical, or that both
+ # are NaNs
+ if isnan(x) or isnan(y):
+ if isnan(x) == isnan(y):
+ return
+ elif x == y and (x != 0.0 or copysign(1.0, x) == copysign(1.0, y)):
+ return
+ self.fail('%r not identical to %r' % (x, y))
+
+ def test_ends(self):
+ self.identical(self.MIN, ldexp(1.0, -1022))
+ self.identical(self.TINY, ldexp(1.0, -1074))
+ self.identical(self.EPS, ldexp(1.0, -52))
+ self.identical(self.MAX, 2.*(ldexp(1.0, 1023) - ldexp(1.0, 970)))
+
+ def test_invalid_inputs(self):
+ invalid_inputs = [
+ 'infi', # misspelt infinities and nans
+ '-Infinit',
+ '++inf',
+ '-+Inf',
+ '--nan',
+ '+-NaN',
+ 'snan',
+ 'NaNs',
+ 'nna',
+ 'an',
+ 'nf',
+ 'nfinity',
+ 'inity',
+ 'iinity',
+ '0xnan',
+ '',
+ ' ',
+ 'x1.0p0',
+ '0xX1.0p0',
+ '+ 0x1.0p0', # internal whitespace
+ '- 0x1.0p0',
+ '0 x1.0p0',
+ '0x 1.0p0',
+ '0x1 2.0p0',
+ '+0x1 .0p0',
+ '0x1. 0p0',
+ '-0x1.0 1p0',
+ '-0x1.0 p0',
+ '+0x1.0p +0',
+ '0x1.0p -0',
+ '0x1.0p 0',
+ '+0x1.0p+ 0',
+ '-0x1.0p- 0',
+ '++0x1.0p-0', # double signs
+ '--0x1.0p0',
+ '+-0x1.0p+0',
+ '-+0x1.0p0',
+ '0x1.0p++0',
+ '+0x1.0p+-0',
+ '-0x1.0p-+0',
+ '0x1.0p--0',
+ '0x1.0.p0',
+ '0x.p0', # no hex digits before or after point
+ '0x1,p0', # wrong decimal point character
+ '0x1pa',
+ u'0x1p\uff10', # fullwidth Unicode digits
+ u'\uff10x1p0',
+ u'0x\uff11p0',
+ u'0x1.\uff10p0',
+ '0x1p0 \n 0x2p0',
+ '0x1p0\0 0x1p0', # embedded null byte is not end of string
+ ]
+ for x in invalid_inputs:
+ try:
+ result = fromHex(x)
+ except ValueError:
+ pass
+ else:
+ self.fail('Expected float.fromhex(%r) to raise ValueError; '
+ 'got %r instead' % (x, result))
+
+
+ def test_whitespace(self):
+ value_pairs = [
+ ('inf', INF),
+ ('-Infinity', -INF),
+ ('nan', NAN),
+ ('1.0', 1.0),
+ ('-0x.2', -0.125),
+ ('-0.0', -0.0)
+ ]
+ whitespace = [
+ '',
+ ' ',
+ '\t',
+ '\n',
+ '\n \t',
+ '\f',
+ '\v',
+ '\r'
+ ]
+ for inp, expected in value_pairs:
+ for lead in whitespace:
+ for trail in whitespace:
+ got = fromHex(lead + inp + trail)
+ self.identical(got, expected)
+
+
+ def test_from_hex(self):
+ MIN = self.MIN;
+ MAX = self.MAX;
+ TINY = self.TINY;
+ EPS = self.EPS;
+
+ # two spellings of infinity, with optional signs; case-insensitive
+ self.identical(fromHex('inf'), INF)
+ self.identical(fromHex('+Inf'), INF)
+ self.identical(fromHex('-INF'), -INF)
+ self.identical(fromHex('iNf'), INF)
+ self.identical(fromHex('Infinity'), INF)
+ self.identical(fromHex('+INFINITY'), INF)
+ self.identical(fromHex('-infinity'), -INF)
+ self.identical(fromHex('-iNFiNitY'), -INF)
+
+ # nans with optional sign; case insensitive
+ self.identical(fromHex('nan'), NAN)
+ self.identical(fromHex('+NaN'), NAN)
+ self.identical(fromHex('-NaN'), NAN)
+ self.identical(fromHex('-nAN'), NAN)
+
+ # variations in input format
+ self.identical(fromHex('1'), 1.0)
+ self.identical(fromHex('+1'), 1.0)
+ self.identical(fromHex('1.'), 1.0)
+ self.identical(fromHex('1.0'), 1.0)
+ self.identical(fromHex('1.0p0'), 1.0)
+ self.identical(fromHex('01'), 1.0)
+ self.identical(fromHex('01.'), 1.0)
+ self.identical(fromHex('0x1'), 1.0)
+ self.identical(fromHex('0x1.'), 1.0)
+ self.identical(fromHex('0x1.0'), 1.0)
+ self.identical(fromHex('+0x1.0'), 1.0)
+ self.identical(fromHex('0x1p0'), 1.0)
+ self.identical(fromHex('0X1p0'), 1.0)
+ self.identical(fromHex('0X1P0'), 1.0)
+ self.identical(fromHex('0x1P0'), 1.0)
+ self.identical(fromHex('0x1.p0'), 1.0)
+ self.identical(fromHex('0x1.0p0'), 1.0)
+ self.identical(fromHex('0x.1p4'), 1.0)
+ self.identical(fromHex('0x.1p04'), 1.0)
+ self.identical(fromHex('0x.1p004'), 1.0)
+ self.identical(fromHex('0x1p+0'), 1.0)
+ self.identical(fromHex('0x1P-0'), 1.0)
+ self.identical(fromHex('+0x1p0'), 1.0)
+ self.identical(fromHex('0x01p0'), 1.0)
+ self.identical(fromHex('0x1p00'), 1.0)
+ self.identical(fromHex(u'0x1p0'), 1.0)
+ self.identical(fromHex(' 0x1p0 '), 1.0)
+ self.identical(fromHex('\n 0x1p0'), 1.0)
+ self.identical(fromHex('0x1p0 \t'), 1.0)
+ self.identical(fromHex('0xap0'), 10.0)
+ self.identical(fromHex('0xAp0'), 10.0)
+ self.identical(fromHex('0xaP0'), 10.0)
+ self.identical(fromHex('0xAP0'), 10.0)
+ self.identical(fromHex('0xbep0'), 190.0)
+ self.identical(fromHex('0xBep0'), 190.0)
+ self.identical(fromHex('0xbEp0'), 190.0)
+ self.identical(fromHex('0XBE0P-4'), 190.0)
+ self.identical(fromHex('0xBEp0'), 190.0)
+ self.identical(fromHex('0xB.Ep4'), 190.0)
+ self.identical(fromHex('0x.BEp8'), 190.0)
+ self.identical(fromHex('0x.0BEp12'), 190.0)
+
+ # moving the point around
+ pi = fromHex('0x1.921fb54442d18p1')
+ self.identical(fromHex('0x.006487ed5110b46p11'), pi)
+ self.identical(fromHex('0x.00c90fdaa22168cp10'), pi)
+ self.identical(fromHex('0x.01921fb54442d18p9'), pi)
+ self.identical(fromHex('0x.03243f6a8885a3p8'), pi)
+ self.identical(fromHex('0x.06487ed5110b46p7'), pi)
+ self.identical(fromHex('0x.0c90fdaa22168cp6'), pi)
+ self.identical(fromHex('0x.1921fb54442d18p5'), pi)
+ self.identical(fromHex('0x.3243f6a8885a3p4'), pi)
+ self.identical(fromHex('0x.6487ed5110b46p3'), pi)
+ self.identical(fromHex('0x.c90fdaa22168cp2'), pi)
+ self.identical(fromHex('0x1.921fb54442d18p1'), pi)
+ self.identical(fromHex('0x3.243f6a8885a3p0'), pi)
+ self.identical(fromHex('0x6.487ed5110b46p-1'), pi)
+ self.identical(fromHex('0xc.90fdaa22168cp-2'), pi)
+ self.identical(fromHex('0x19.21fb54442d18p-3'), pi)
+ self.identical(fromHex('0x32.43f6a8885a3p-4'), pi)
+ self.identical(fromHex('0x64.87ed5110b46p-5'), pi)
+ self.identical(fromHex('0xc9.0fdaa22168cp-6'), pi)
+ self.identical(fromHex('0x192.1fb54442d18p-7'), pi)
+ self.identical(fromHex('0x324.3f6a8885a3p-8'), pi)
+ self.identical(fromHex('0x648.7ed5110b46p-9'), pi)
+ self.identical(fromHex('0xc90.fdaa22168cp-10'), pi)
+ self.identical(fromHex('0x1921.fb54442d18p-11'), pi)
+ # ...
+ self.identical(fromHex('0x1921fb54442d1.8p-47'), pi)
+ self.identical(fromHex('0x3243f6a8885a3p-48'), pi)
+ self.identical(fromHex('0x6487ed5110b46p-49'), pi)
+ self.identical(fromHex('0xc90fdaa22168cp-50'), pi)
+ self.identical(fromHex('0x1921fb54442d18p-51'), pi)
+ self.identical(fromHex('0x3243f6a8885a30p-52'), pi)
+ self.identical(fromHex('0x6487ed5110b460p-53'), pi)
+ self.identical(fromHex('0xc90fdaa22168c0p-54'), pi)
+ self.identical(fromHex('0x1921fb54442d180p-55'), pi)
+
+
+ # results that should overflow...
+ self.assertRaises(OverflowError, fromHex, '-0x1p1024')
+ self.assertRaises(OverflowError, fromHex, '0x1p+1025')
+ self.assertRaises(OverflowError, fromHex, '+0X1p1030')
+ self.assertRaises(OverflowError, fromHex, '-0x1p+1100')
+ self.assertRaises(OverflowError, fromHex, '0X1p123456789123456789')
+ self.assertRaises(OverflowError, fromHex, '+0X.8p+1025')
+ self.assertRaises(OverflowError, fromHex, '+0x0.8p1025')
+ self.assertRaises(OverflowError, fromHex, '-0x0.4p1026')
+ self.assertRaises(OverflowError, fromHex, '0X2p+1023')
+ self.assertRaises(OverflowError, fromHex, '0x2.p1023')
+ self.assertRaises(OverflowError, fromHex, '-0x2.0p+1023')
+ self.assertRaises(OverflowError, fromHex, '+0X4p+1022')
+ self.assertRaises(OverflowError, fromHex, '0x1.ffffffffffffffp+1023')
+ self.assertRaises(OverflowError, fromHex, '-0X1.fffffffffffff9p1023')
+ self.assertRaises(OverflowError, fromHex, '0X1.fffffffffffff8p1023')
+ self.assertRaises(OverflowError, fromHex, '+0x3.fffffffffffffp1022')
+ self.assertRaises(OverflowError, fromHex, '0x3fffffffffffffp+970')
+ self.assertRaises(OverflowError, fromHex, '0x10000000000000000p960')
+ self.assertRaises(OverflowError, fromHex, '-0Xffffffffffffffffp960')
+
+ # ...and those that round to +-max float
+ self.identical(fromHex('+0x1.fffffffffffffp+1023'), MAX)
+ self.identical(fromHex('-0X1.fffffffffffff7p1023'), -MAX)
+ self.identical(fromHex('0X1.fffffffffffff7fffffffffffffp1023'), MAX)
+
+ # zeros
+ self.identical(fromHex('0x0p0'), 0.0)
+ self.identical(fromHex('0x0p1000'), 0.0)
+ self.identical(fromHex('-0x0p1023'), -0.0)
+ self.identical(fromHex('0X0p1024'), 0.0)
+ self.identical(fromHex('-0x0p1025'), -0.0)
+ self.identical(fromHex('0X0p2000'), 0.0)
+ self.identical(fromHex('0x0p123456789123456789'), 0.0)
+ self.identical(fromHex('-0X0p-0'), -0.0)
+ self.identical(fromHex('-0X0p-1000'), -0.0)
+ self.identical(fromHex('0x0p-1023'), 0.0)
+ self.identical(fromHex('-0X0p-1024'), -0.0)
+ self.identical(fromHex('-0x0p-1025'), -0.0)
+ self.identical(fromHex('-0x0p-1072'), -0.0)
+ self.identical(fromHex('0X0p-1073'), 0.0)
+ self.identical(fromHex('-0x0p-1074'), -0.0)
+ self.identical(fromHex('0x0p-1075'), 0.0)
+ self.identical(fromHex('0X0p-1076'), 0.0)
+ self.identical(fromHex('-0X0p-2000'), -0.0)
+ self.identical(fromHex('-0x0p-123456789123456789'), -0.0)
+
+ # values that should underflow to 0
+ self.identical(fromHex('0X1p-1075'), 0.0)
+ self.identical(fromHex('-0X1p-1075'), -0.0)
+ self.identical(fromHex('-0x1p-123456789123456789'), -0.0)
+ self.identical(fromHex('0x1.00000000000000001p-1075'), TINY)
+ self.identical(fromHex('-0x1.1p-1075'), -TINY)
+ self.identical(fromHex('0x1.fffffffffffffffffp-1075'), TINY)
+
+ # check round-half-even is working correctly near 0 ...
+ self.identical(fromHex('0x1p-1076'), 0.0)
+ self.identical(fromHex('0X2p-1076'), 0.0)
+ self.identical(fromHex('0X3p-1076'), TINY)
+ self.identical(fromHex('0x4p-1076'), TINY)
+ self.identical(fromHex('0X5p-1076'), TINY)
+ self.identical(fromHex('0X6p-1076'), 2*TINY)
+ self.identical(fromHex('0x7p-1076'), 2*TINY)
+ self.identical(fromHex('0X8p-1076'), 2*TINY)
+ self.identical(fromHex('0X9p-1076'), 2*TINY)
+ self.identical(fromHex('0xap-1076'), 2*TINY)
+ self.identical(fromHex('0Xbp-1076'), 3*TINY)
+ self.identical(fromHex('0xcp-1076'), 3*TINY)
+ self.identical(fromHex('0Xdp-1076'), 3*TINY)
+ self.identical(fromHex('0Xep-1076'), 4*TINY)
+ self.identical(fromHex('0xfp-1076'), 4*TINY)
+ self.identical(fromHex('0x10p-1076'), 4*TINY)
+ self.identical(fromHex('-0x1p-1076'), -0.0)
+ self.identical(fromHex('-0X2p-1076'), -0.0)
+ self.identical(fromHex('-0x3p-1076'), -TINY)
+ self.identical(fromHex('-0X4p-1076'), -TINY)
+ self.identical(fromHex('-0x5p-1076'), -TINY)
+ self.identical(fromHex('-0x6p-1076'), -2*TINY)
+ self.identical(fromHex('-0X7p-1076'), -2*TINY)
+ self.identical(fromHex('-0X8p-1076'), -2*TINY)
+ self.identical(fromHex('-0X9p-1076'), -2*TINY)
+ self.identical(fromHex('-0Xap-1076'), -2*TINY)
+ self.identical(fromHex('-0xbp-1076'), -3*TINY)
+ self.identical(fromHex('-0xcp-1076'), -3*TINY)
+ self.identical(fromHex('-0Xdp-1076'), -3*TINY)
+ self.identical(fromHex('-0xep-1076'), -4*TINY)
+ self.identical(fromHex('-0Xfp-1076'), -4*TINY)
+ self.identical(fromHex('-0X10p-1076'), -4*TINY)
+
+ # ... and near MIN ...
+ self.identical(fromHex('0x0.ffffffffffffd6p-1022'), MIN-3*TINY)
+ self.identical(fromHex('0x0.ffffffffffffd8p-1022'), MIN-2*TINY)
+ self.identical(fromHex('0x0.ffffffffffffdap-1022'), MIN-2*TINY)
+ self.identical(fromHex('0x0.ffffffffffffdcp-1022'), MIN-2*TINY)
+ self.identical(fromHex('0x0.ffffffffffffdep-1022'), MIN-2*TINY)
+ self.identical(fromHex('0x0.ffffffffffffe0p-1022'), MIN-2*TINY)
+ self.identical(fromHex('0x0.ffffffffffffe2p-1022'), MIN-2*TINY)
+ self.identical(fromHex('0x0.ffffffffffffe4p-1022'), MIN-2*TINY)
+ self.identical(fromHex('0x0.ffffffffffffe6p-1022'), MIN-2*TINY)
+ self.identical(fromHex('0x0.ffffffffffffe8p-1022'), MIN-2*TINY)
+ self.identical(fromHex('0x0.ffffffffffffeap-1022'), MIN-TINY)
+ self.identical(fromHex('0x0.ffffffffffffecp-1022'), MIN-TINY)
+ self.identical(fromHex('0x0.ffffffffffffeep-1022'), MIN-TINY)
+ self.identical(fromHex('0x0.fffffffffffff0p-1022'), MIN-TINY)
+ self.identical(fromHex('0x0.fffffffffffff2p-1022'), MIN-TINY)
+ self.identical(fromHex('0x0.fffffffffffff4p-1022'), MIN-TINY)
+ self.identical(fromHex('0x0.fffffffffffff6p-1022'), MIN-TINY)
+ self.identical(fromHex('0x0.fffffffffffff8p-1022'), MIN)
+ self.identical(fromHex('0x0.fffffffffffffap-1022'), MIN)
+ self.identical(fromHex('0x0.fffffffffffffcp-1022'), MIN)
+ self.identical(fromHex('0x0.fffffffffffffep-1022'), MIN)
+ self.identical(fromHex('0x1.00000000000000p-1022'), MIN)
+ self.identical(fromHex('0x1.00000000000002p-1022'), MIN)
+ self.identical(fromHex('0x1.00000000000004p-1022'), MIN)
+ self.identical(fromHex('0x1.00000000000006p-1022'), MIN)
+ self.identical(fromHex('0x1.00000000000008p-1022'), MIN)
+ self.identical(fromHex('0x1.0000000000000ap-1022'), MIN+TINY)
+ self.identical(fromHex('0x1.0000000000000cp-1022'), MIN+TINY)
+ self.identical(fromHex('0x1.0000000000000ep-1022'), MIN+TINY)
+ self.identical(fromHex('0x1.00000000000010p-1022'), MIN+TINY)
+ self.identical(fromHex('0x1.00000000000012p-1022'), MIN+TINY)
+ self.identical(fromHex('0x1.00000000000014p-1022'), MIN+TINY)
+ self.identical(fromHex('0x1.00000000000016p-1022'), MIN+TINY)
+ self.identical(fromHex('0x1.00000000000018p-1022'), MIN+2*TINY)
+
+ # ... and near 1.0.
+ self.identical(fromHex('0x0.fffffffffffff0p0'), 1.0-EPS)
+ self.identical(fromHex('0x0.fffffffffffff1p0'), 1.0-EPS)
+ self.identical(fromHex('0X0.fffffffffffff2p0'), 1.0-EPS)
+ self.identical(fromHex('0x0.fffffffffffff3p0'), 1.0-EPS)
+ self.identical(fromHex('0X0.fffffffffffff4p0'), 1.0-EPS)
+ self.identical(fromHex('0X0.fffffffffffff5p0'), 1.0-EPS/2)
+ self.identical(fromHex('0X0.fffffffffffff6p0'), 1.0-EPS/2)
+ self.identical(fromHex('0x0.fffffffffffff7p0'), 1.0-EPS/2)
+ self.identical(fromHex('0x0.fffffffffffff8p0'), 1.0-EPS/2)
+ self.identical(fromHex('0X0.fffffffffffff9p0'), 1.0-EPS/2)
+ self.identical(fromHex('0X0.fffffffffffffap0'), 1.0-EPS/2)
+ self.identical(fromHex('0x0.fffffffffffffbp0'), 1.0-EPS/2)
+ self.identical(fromHex('0X0.fffffffffffffcp0'), 1.0)
+ self.identical(fromHex('0x0.fffffffffffffdp0'), 1.0)
+ self.identical(fromHex('0X0.fffffffffffffep0'), 1.0)
+ self.identical(fromHex('0x0.ffffffffffffffp0'), 1.0)
+ self.identical(fromHex('0X1.00000000000000p0'), 1.0)
+ self.identical(fromHex('0X1.00000000000001p0'), 1.0)
+ self.identical(fromHex('0x1.00000000000002p0'), 1.0)
+ self.identical(fromHex('0X1.00000000000003p0'), 1.0)
+ self.identical(fromHex('0x1.00000000000004p0'), 1.0)
+ self.identical(fromHex('0X1.00000000000005p0'), 1.0)
+ self.identical(fromHex('0X1.00000000000006p0'), 1.0)
+ self.identical(fromHex('0X1.00000000000007p0'), 1.0)
+ self.identical(fromHex('0x1.00000000000007ffffffffffffffffffffp0'),
+ 1.0)
+ self.identical(fromHex('0x1.00000000000008p0'), 1.0)
+ self.identical(fromHex('0x1.00000000000008000000000000000001p0'),
+ 1+EPS)
+ self.identical(fromHex('0X1.00000000000009p0'), 1.0+EPS)
+ self.identical(fromHex('0x1.0000000000000ap0'), 1.0+EPS)
+ self.identical(fromHex('0x1.0000000000000bp0'), 1.0+EPS)
+ self.identical(fromHex('0X1.0000000000000cp0'), 1.0+EPS)
+ self.identical(fromHex('0x1.0000000000000dp0'), 1.0+EPS)
+ self.identical(fromHex('0x1.0000000000000ep0'), 1.0+EPS)
+ self.identical(fromHex('0X1.0000000000000fp0'), 1.0+EPS)
+ self.identical(fromHex('0x1.00000000000010p0'), 1.0+EPS)
+ self.identical(fromHex('0X1.00000000000011p0'), 1.0+EPS)
+ self.identical(fromHex('0x1.00000000000012p0'), 1.0+EPS)
+ self.identical(fromHex('0X1.00000000000013p0'), 1.0+EPS)
+ self.identical(fromHex('0X1.00000000000014p0'), 1.0+EPS)
+ self.identical(fromHex('0x1.00000000000015p0'), 1.0+EPS)
+ self.identical(fromHex('0x1.00000000000016p0'), 1.0+EPS)
+ self.identical(fromHex('0X1.00000000000017p0'), 1.0+EPS)
+ self.identical(fromHex('0x1.00000000000017ffffffffffffffffffffp0'),
+ 1.0+EPS)
+ self.identical(fromHex('0x1.00000000000018p0'), 1.0+2*EPS)
+ self.identical(fromHex('0X1.00000000000018000000000000000001p0'),
+ 1.0+2*EPS)
+ self.identical(fromHex('0x1.00000000000019p0'), 1.0+2*EPS)
+ self.identical(fromHex('0X1.0000000000001ap0'), 1.0+2*EPS)
+ self.identical(fromHex('0X1.0000000000001bp0'), 1.0+2*EPS)
+ self.identical(fromHex('0x1.0000000000001cp0'), 1.0+2*EPS)
+ self.identical(fromHex('0x1.0000000000001dp0'), 1.0+2*EPS)
+ self.identical(fromHex('0x1.0000000000001ep0'), 1.0+2*EPS)
+ self.identical(fromHex('0X1.0000000000001fp0'), 1.0+2*EPS)
+ self.identical(fromHex('0x1.00000000000020p0'), 1.0+2*EPS)
+
+ def test_roundtrip(self):
+ def roundtrip(x):
+ return fromHex(toHex(x))
+
+ for x in [NAN, INF, self.MAX, self.MIN, self.MIN-self.TINY, self.TINY, 0.0]:
+ self.identical(x, roundtrip(x))
+ self.identical(-x, roundtrip(-x))
+
+ # fromHex(toHex(x)) should exactly recover x, for any non-NaN float x.
+ import random
+ for i in xrange(10000):
+ e = random.randrange(-1200, 1200)
+ m = random.random()
+ s = random.choice([1.0, -1.0])
+ try:
+ x = s*ldexp(m, e)
+ except OverflowError:
+ pass
+ else:
+ self.identical(x, fromHex(toHex(x)))
+
+
+def test_main():
+ test_support.run_unittest(
+ GeneralFloatCases,
+ FormatFunctionsTestCase,
+ UnknownFormatTestCase,
+ IEEEFormatTestCase,
+ ReprTestCase,
+ RoundTestCase,
+ InfNanTest,
+ HexFloatTestCase,
+ )
+
+if __name__ == '__main__':
+ test_main()
--
Repository URL: http://hg.python.org/jython
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