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gh-87790: support thousands separators for formatting fractional part of floats (#125304)

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```pycon
>>> f"{123_456.123_456:_._f}"  # Whole and fractional
'123_456.123_456'
>>> f"{123_456.123_456:_f}"    # Integer component only
'123_456.123456'
>>> f"{123_456.123_456:._f}"   # Fractional component only
'123456.123_456'
>>> f"{123_456.123_456:.4_f}"  # with precision
'123456.1_235'
```
This commit is contained in:
Sergey B Kirpichev 2025-02-25 18:27:07 +03:00 • committed by GitHub
parent fa6a8140dd
commit f39a07be47
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9 changed files with 218 additions and 45 deletions
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22
Lib/test/test_float.py
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@ -754,6 +754,28 @@ class FormatTestCase(unittest.TestCase):
self.assertEqual(format(INF, 'f'), 'inf')
self.assertEqual(format(INF, 'F'), 'INF')
# thousands separators
x = 123_456.123_456
self.assertEqual(format(x, '_f'), '123_456.123456')
self.assertEqual(format(x, ',f'), '123,456.123456')
self.assertEqual(format(x, '._f'), '123456.123_456')
self.assertEqual(format(x, '.,f'), '123456.123,456')
self.assertEqual(format(x, '_._f'), '123_456.123_456')
self.assertEqual(format(x, ',.,f'), '123,456.123,456')
self.assertEqual(format(x, '.10_f'), '123456.123_456_000_0')
self.assertEqual(format(x, '.10,f'), '123456.123,456,000,0')
self.assertEqual(format(x, '>21._f'), ' 123456.123_456')
self.assertEqual(format(x, '<21._f'), '123456.123_456 ')
self.assertEqual(format(x, '+.11_e'), '+1.234_561_234_56e+05')
self.assertEqual(format(x, '+.11,e'), '+1.234,561,234,56e+05')
self.assertRaises(ValueError, format, x, '._6f')
self.assertRaises(ValueError, format, x, '.,_f')
self.assertRaises(ValueError, format, x, '.6,_f')
self.assertRaises(ValueError, format, x, '.6_,f')
self.assertRaises(ValueError, format, x, '.6_n')
self.assertRaises(ValueError, format, x, '.6,n')
@support.requires_IEEE_754
def test_format_testfile(self):
with open(format_testfile, encoding="utf-8") as testfile: