Lib.test.test_float_jy.py Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jython-standalone Show documentation
Show all versions of jython-standalone Show documentation
Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
"""Float tests
Made for Jython.
"""
import math
import sys
import unittest
from test import test_support
jython = test_support.is_jython
class FloatTestCase(unittest.TestCase):
def test_float_repr(self):
self.assertEqual(repr(12345678.000000005), '12345678.000000006')
self.assertEqual(repr(12345678.0000000005), '12345678.0')
self.assertEqual(repr(math.pi**-100),
jython and '1.9275814160560203e-50' or '1.9275814160560206e-50')
self.assertEqual(repr(-1.0), '-1.0')
self.assertEqual(repr(-9876.543210),
jython and '-9876.54321' or '-9876.5432099999998')
self.assertEqual(repr(0.123456789e+35), '1.23456789e+34')
def test_float_str(self):
self.assertEqual(str(12345678.000005), '12345678.0')
self.assertEqual(str(12345678.00005),
jython and '12345678.0' or '12345678.0001')
self.assertEqual(str(12345678.00005),
jython and '12345678.0' or '12345678.0001')
self.assertEqual(str(12345678.0005), '12345678.0005')
self.assertEqual(str(math.pi**-100), '1.92758141606e-50')
self.assertEqual(str(0.0), '0.0')
self.assertEqual(str(-1.0), '-1.0')
self.assertEqual(str(-9876.543210), '-9876.54321')
self.assertEqual(str(23456789012E666), 'inf')
self.assertEqual(str(-23456789012E666), '-inf')
def test_float_str_formatting(self):
self.assertEqual('%.13g' % 12345678.00005, '12345678.00005')
self.assertEqual('%.12g' % 12345678.00005,
jython and '12345678' or '12345678.0001')
self.assertEqual('%.11g' % 12345678.00005, '12345678')
# XXX: The exponential formatter isn't totally correct, e.g. our
# output here is really .13g
self.assertEqual('%.12g' % math.pi**-100, '1.92758141606e-50')
self.assertEqual('%.5g' % 123.005, '123')
self.assertEqual('%#.5g' % 123.005, '123.00')
self.assertEqual('%#g' % 0.001, '0.00100000')
self.assertEqual('%#.5g' % 0.001, '0.0010000')
self.assertEqual('%#.1g' % 0.0001, '0.0001')
self.assertEqual('%#.4g' % 100, '100.0')
self.assertEqual('%#.4g' % 100.25, '100.2')
self.assertEqual('%g' % 0.00001, '1e-05')
self.assertEqual('%#g' % 0.00001, '1.00000e-05')
self.assertEqual('%e' % -400.0, '-4.000000e+02')
self.assertEqual('%.2g' % 99, '99')
self.assertEqual('%.2g' % 100, '1e+02')
def test_overflow(self):
shuge = '12345' * 120
shuge_float = float(shuge)
shuge_int = int(shuge)
self.assertRaises(OverflowError, float, shuge_int)
self.assertRaises(OverflowError, int, shuge_float)
# and cmp should not overflow
self.assertNotEqual(0.1, shuge_int)
def test_nan(self):
nan = float('nan')
self.assert_(type(nan), float)
if jython:
# support Java syntax
self.assert_(type(float('NaN')), float)
self.assertNotEqual(nan, float('nan'))
self.assertNotEqual(nan, nan)
self.assertEqual(cmp(nan, float('nan')), 1)
self.assertEqual(cmp(nan, nan), 0)
for i in (-1, 1, -1.0, 1.0):
self.assertEqual(cmp(nan, i), -1)
self.assertEqual(cmp(i, nan), 1)
def test_infinity(self):
self.assert_(type(float('Infinity')), float)
self.assert_(type(float('inf')), float)
self.assertRaises(OverflowError, long, float('Infinity'))
def test_float_none(self):
self.assertRaises(TypeError, float, None)
def test_pow(self):
class Foo(object):
def __rpow__(self, other):
return other ** 2
# regression in 2.5 alphas
self.assertEqual(4.0 ** Foo(), 16.0)
def test_faux(self):
class F(object):
def __float__(self):
return 1.6
self.assertEqual(math.cos(1.6), math.cos(F()))
def test_main():
test_support.run_unittest(FloatTestCase)
if __name__ == '__main__':
test_main()