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Issue 3008: hex/oct/bin can show floats exactly.

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This commit is contained in:
Raymond Hettinger 2008-06-21 06:39:53 +00:00
parent db53c1eb68
commit e0e711446b
3 changed files with 90 additions and 2 deletions
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27
Lib/test/test_builtin.py
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@ -631,6 +631,15 @@ class BuiltinTest(unittest.TestCase):
self.assertEqual(hex(-16), '-0x10')
self.assertEqual(hex(-16L), '-0x10L')
self.assertRaises(TypeError, hex, {})
self.assertEqual(hex(3.125), '0x19 * 2.0 ** -3')
self.assertEqual(hex(0.0), '0x0 * 2.0 ** 0')
for sv in float('nan'), float('inf'), float('-inf'):
self.assertEqual(hex(sv), repr(sv))
for i in range(100):
x = random.expovariate(.05)
self.assertEqual(eval(hex(x)), x, (x, hex(x), eval(hex(x))))
self.assertEqual(eval(hex(-x)), -x)
self.assertEqual(hex(-x), ('-' + hex(x)))
def test_id(self):
id(None)
@ -914,6 +923,15 @@ class BuiltinTest(unittest.TestCase):
self.assertEqual(oct(-100), '-0144')
self.assertEqual(oct(-100L), '-0144L')
self.assertRaises(TypeError, oct, ())
self.assertEqual(oct(3.125), '031 * 2.0 ** -3')
self.assertEqual(oct(0.0), '0 * 2.0 ** 0')
for sv in float('nan'), float('inf'), float('-inf'):
self.assertEqual(oct(sv), repr(sv))
for i in range(100):
x = random.expovariate(.05)
self.assertEqual(eval(oct(x)), x)
self.assertEqual(eval(oct(-x)), -x)
self.assertEqual(oct(-x), ('-' + oct(x)))
def write_testfile(self):
# NB the first 4 lines are also used to test input and raw_input, below
@ -1466,6 +1484,15 @@ class BuiltinTest(unittest.TestCase):
self.assertEqual(bin(2**65-1), '0b' + '1' * 65)
self.assertEqual(bin(-(2**65)), '-0b1' + '0' * 65)
self.assertEqual(bin(-(2**65-1)), '-0b' + '1' * 65)
self.assertEqual(bin(3.125), '0b11001 * 2.0 ** -3')
self.assertEqual(bin(0.0), '0b0 * 2.0 ** 0')
for sv in float('nan'), float('inf'), float('-inf'):
self.assertEqual(bin(sv), repr(sv))
for i in range(100):
x = random.expovariate(.05)
self.assertEqual(eval(bin(x)), x)
self.assertEqual(eval(bin(-x)), -x)
self.assertEqual(bin(-x), ('-' + bin(x)))
class TestSorted(unittest.TestCase):