| |
| import unittest, struct |
| import os |
| from test import support |
| import math |
| from math import isinf, isnan |
| import operator |
| |
| INF = float("inf") |
| NAN = float("nan") |
| |
| class GeneralFloatCases(unittest.TestCase): |
| |
| def test_float(self): |
| self.assertEqual(float(3.14), 3.14) |
| self.assertEqual(float(314), 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") |
| if have_unicode: |
| self.assertEqual(float(unicode(" 3.14 ")), 3.14) |
| self.assertEqual(float(unicode(" \u0663.\u0661\u0664 ",'raw-unicode-escape')), 3.14) |
| # Implementation limitation in PyFloat_FromString() |
| self.assertRaises(ValueError, float, unicode("1"*10000)) |
| |
| @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 syntac |
| 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(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 |
| |
| 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)) |
| |
| 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) |
| |
| 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.assert_(float.__getformat__('double') in |
| ['unknown', 'IEEE, big-endian', 'IEEE, little-endian']) |
| self.assert_(float.__getformat__('float') in |
| ['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 = b'\x7f\xf0\x00\x00\x00\x00\x00\x00' |
| LE_DOUBLE_INF = bytes(reversed(BE_DOUBLE_INF)) |
| BE_DOUBLE_NAN = b'\x7f\xf8\x00\x00\x00\x00\x00\x00' |
| LE_DOUBLE_NAN = bytes(reversed(BE_DOUBLE_NAN)) |
| |
| BE_FLOAT_INF = b'\x7f\x80\x00\x00' |
| LE_FLOAT_INF = bytes(reversed(BE_FLOAT_INF)) |
| BE_FLOAT_NAN = b'\x7f\xc0\x00\x00' |
| LE_FLOAT_NAN = bytes(reversed(BE_FLOAT_NAN)) |
| |
| # on non-IEEE platforms, attempting to unpack a bit pattern |
| # representing an infinity or a NaN should raise an exception. |
| |
| 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): |
| if float.__getformat__("double").startswith("IEEE"): |
| 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) |
| |
| if float.__getformat__("float").startswith("IEEE"): |
| 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) |
| |
| if float.__getformat__("double").startswith("IEEE"): |
| def test_negative_zero(self): |
| import math |
| 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.assertEquals(pos_pos(), neg_pos()) |
| self.assertEquals(pos_neg(), neg_neg()) |
| |
| class FormatTestCase(unittest.TestCase): |
| 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') |
| |
| |
| 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) |
| |
| 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() |
| |
| # Beginning with Python 2.6 float has cross platform compatible |
| # ways to create and representate inf and nan |
| class InfNanTest(unittest.TestCase): |
| def test_inf_from_str(self): |
| self.assert_(isinf(float("inf"))) |
| self.assert_(isinf(float("+inf"))) |
| self.assert_(isinf(float("-inf"))) |
| |
| self.assertEqual(repr(float("inf")), "inf") |
| self.assertEqual(repr(float("+inf")), "inf") |
| self.assertEqual(repr(float("-inf")), "-inf") |
| |
| self.assertEqual(repr(float("INF")), "inf") |
| self.assertEqual(repr(float("+Inf")), "inf") |
| self.assertEqual(repr(float("-iNF")), "-inf") |
| |
| self.assertEqual(str(float("inf")), "inf") |
| self.assertEqual(str(float("+inf")), "inf") |
| self.assertEqual(str(float("-inf")), "-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") |
| |
| 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.assert_(isnan(float("nan"))) |
| self.assert_(isnan(float("+nan"))) |
| self.assert_(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.assert_(NAN.is_nan()) |
| self.failIf(INF.is_nan()) |
| self.failIf((0.).is_nan()) |
| |
| def notest_float_inf(self): |
| self.assert_(INF.is_inf()) |
| self.failIf(NAN.is_inf()) |
| self.failIf((0.).is_inf()) |
| |
| |
| def test_main(): |
| support.run_unittest( |
| FormatFunctionsTestCase, |
| UnknownFormatTestCase, |
| IEEEFormatTestCase, |
| FormatTestCase, |
| ReprTestCase, |
| InfNanTest, |
| ) |
| |
| if __name__ == '__main__': |
| test_main() |