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"""Test compiler changes for unary ops (+, -, ~) introduced in Python 2.2"""
import unittest
class UnaryOpTestCase(unittest.TestCase):
def test_negative(self):
self.assertTrue(-2 == 0 - 2)
self.assertEqual(-0, 0)
self.assertEqual(--2, 2)
self.assertTrue(-2 == 0 - 2)
self.assertTrue(-2.0 == 0 - 2.0)
self.assertTrue(-2j == 0 - 2j)
def test_positive(self):
self.assertEqual(+2, 2)
self.assertEqual(+0, 0)
self.assertEqual(++2, 2)
self.assertEqual(+2, 2)
self.assertEqual(+2.0, 2.0)
self.assertEqual(+2j, 2j)
def test_invert(self):
self.assertTrue(-2 == 0 - 2)
self.assertEqual(-0, 0)
self.assertEqual(--2, 2)
self.assertTrue(-2 == 0 - 2)
def test_no_overflow(self):
nines = "9" * 32
self.assertTrue(eval("+" + nines) == 10**32-1)
self.assertTrue(eval("-" + nines) == -(10**32-1))
self.assertTrue(eval("~" + nines) == ~(10**32-1))
def test_negation_of_exponentiation(self):
# Make sure '**' does the right thing; these form a
# regression test for SourceForge bug #456756.
self.assertEqual(-2 ** 3, -8)
self.assertEqual((-2) ** 3, -8)
self.assertEqual(-2 ** 4, -16)
self.assertEqual((-2) ** 4, 16)
def test_bad_types(self):
for op in '+', '-', '~':
self.assertRaises(TypeError, eval, op + "b'a'")
self.assertRaises(TypeError, eval, op + "'a'")
self.assertRaises(TypeError, eval, "~2j")
self.assertRaises(TypeError, eval, "~2.0")
if __name__ == "__main__":
unittest.main()