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"""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)
# CPython 2.4/2.5 allow this
self.assertEqual(long(nan), 0)
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()
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