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bpo-40780: Fix failure of _Py_dg_dtoa to remove trailing zeros (GH-20435) (GH-20514)

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* Fix failure of _Py_dg_dtoa to remove trailing zeros

* Add regression test and news entry

* Add explanation about why it's safe to strip trailing zeros

* Make code safer, clean up comments, add change note at top of file

* Nitpick: avoid implicit int-to-float conversion in tests
(cherry picked from commit 895c9c1d43)

Co-authored-by: Mark Dickinson <mdickinson@enthought.com>
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Miss Islington (bot) 2020-05-29 06:46:54 -07:00 • committed by GitHub
parent 8fcc1474ef
commit ad088ca5c6
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11
Lib/test/test_format.py
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@ -484,6 +484,17 @@ class FormatTest(unittest.TestCase):
with self.assertRaises(ValueError) as cm:
format(c, ".%sf" % (INT_MAX + 1))
def test_g_format_has_no_trailing_zeros(self):
# regression test for bugs.python.org/issue40780
self.assertEqual("%.3g" % 1505.0, "1.5e+03")
self.assertEqual("%#.3g" % 1505.0, "1.50e+03")
self.assertEqual(format(1505.0, ".3g"), "1.5e+03")
self.assertEqual(format(1505.0, "#.3g"), "1.50e+03")
self.assertEqual(format(12300050.0, ".6g"), "1.23e+07")
self.assertEqual(format(12300050.0, "#.6g"), "1.23000e+07")
if __name__ == "__main__":
unittest.main()