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"""Test compiler changes for unary ops (+, -, ~) introduced in Python 2.2"""
import unittest
from test.test_support import run_unittest, have_unicode
class UnaryOpTestCase(unittest.TestCase):
def test_negative(self):
self.assertTrue(-2 == 0 - 2)
self.assertTrue(-0 == 0)
self.assertTrue(--2 == 2)
self.assertTrue(-2L == 0 - 2L)
self.assertTrue(-2.0 == 0 - 2.0)
self.assertTrue(-2j == 0 - 2j)
def test_positive(self):
self.assertTrue(+2 == 2)
self.assertTrue(+0 == 0)
self.assertTrue(++2 == 2)
self.assertTrue(+2L == 2L)
self.assertTrue(+2.0 == 2.0)
self.assertTrue(+2j == 2j)
def test_invert(self):
self.assertTrue(-2 == 0 - 2)
self.assertTrue(-0 == 0)
self.assertTrue(--2 == 2)
self.assertTrue(-2L == 0 - 2L)
def test_no_overflow(self):
nines = "9" * 32
self.assertTrue(eval("+" + nines) == eval("+" + nines + "L"))
self.assertTrue(eval("-" + nines) == eval("-" + nines + "L"))
self.assertTrue(eval("~" + nines) == eval("~" + nines + "L"))
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 + "'a'")
if have_unicode:
self.assertRaises(TypeError, eval, op + "u'a'")
self.assertRaises(TypeError, eval, "~2j")
self.assertRaises(TypeError, eval, "~2.0")
def test_main():
run_unittest(UnaryOpTestCase)
if __name__ == "__main__":
test_main()
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