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Merged revisions 76632 via svnmerge from 

svn+ssh://pythondev@svn.python.org/python/trunk

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  r76632 | eric.smith | 2009-12-02 12:43:06 -0500 (Wed, 02 Dec 2009) | 1 line

  Issue #4482: Add tests for special float value formatting.
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This commit is contained in:
Eric Smith 2009-12-02 17:58:24 +00:00
parent bb21e50cdd
commit 8a10ecc051
1 changed files with 35 additions and 0 deletions
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35
Lib/test/test_float.py
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@ -495,6 +495,41 @@ class RoundTestCase(unittest.TestCase):
self.assertEqual(float(format(x, '.3f')), round(x, 3))
@unittest.skipUnless(float.__getformat__("double").startswith("IEEE"),
"test requires IEEE 754 doubles")
def test_format_specials(self):
# Test formatting of nans and infs.
def test(fmt, value, expected):
# Test with both % and format().
self.assertEqual(fmt % value, expected, fmt)
if not '#' in fmt:
# Until issue 7094 is implemented, format() for floats doesn't
# support '#' formatting
fmt = fmt[1:] # strip off the %
self.assertEqual(format(value, fmt), expected, fmt)
for fmt in ['%e', '%f', '%g', '%.0e', '%.6f', '%.20g',
'%#e', '%#f', '%#g', '%#.20e', '%#.15f', '%#.3g']:
pfmt = '%+' + fmt[1:]
sfmt = '% ' + fmt[1:]
test(fmt, INF, 'inf')
test(fmt, -INF, '-inf')
test(fmt, NAN, 'nan')
test(fmt, -NAN, 'nan')
# When asking for a sign, it's always provided. nans are
# always positive.
test(pfmt, INF, '+inf')
test(pfmt, -INF, '-inf')
test(pfmt, NAN, '+nan')
test(pfmt, -NAN, '+nan')
# When using ' ' for a sign code, only infs can be negative.
# Others have a space.
test(sfmt, INF, ' inf')
test(sfmt, -INF, '-inf')
test(sfmt, NAN, ' nan')
test(sfmt, -NAN, ' nan')
# Beginning with Python 2.6 float has cross platform compatible
# ways to create and represent inf and nan