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(Merge 3.3) Issue #18137: Detect integer overflow on precision in

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float.__format__() and complex.__format__().
This commit is contained in:
Victor Stinner 2013-06-23 14:55:43 +02:00
commit 2ab07f01a4
3 changed files with 34 additions and 2 deletions
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17
Lib/test/test_format.py
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@ -331,6 +331,23 @@ class FormatTest(unittest.TestCase):
def test_main():
support.run_unittest(FormatTest)
def test_precision(self):
INT_MAX = 2147483647
f = 1.2
self.assertEqual(format(f, ".0f"), "1")
self.assertEqual(format(f, ".3f"), "1.200")
with self.assertRaises(ValueError) as cm:
format(f, ".%sf" % (INT_MAX + 1))
self.assertEqual(str(cm.exception), "precision too big")
c = complex(f)
self.assertEqual(format(f, ".0f"), "1")
self.assertEqual(format(f, ".3f"), "1.200")
with self.assertRaises(ValueError) as cm:
format(f, ".%sf" % (INT_MAX + 1))
self.assertEqual(str(cm.exception), "precision too big")
if __name__ == "__main__":
unittest.main()