gh-135025: allow unicode in floating-point format strings for Fractions

Author: skirpichev

Lib/fractions.py

@@ -167,12 +167,12 @@ def _round_to_figures(n, d, figures):
     (?P<alt>\#)?
     # A '0' that's *not* followed by another digit is parsed as a minimum width
     # rather than a zeropad flag.
-    (?P<zeropad>0(?=[0-9]))?
-    (?P<minimumwidth>[0-9]+)?
+    (?P<zeropad>0(?=\d))?
+    (?P<minimumwidth>\d+)?
     (?P<thousands_sep>[,_])?
     (?:\.
-        (?=[,_0-9])  # lookahead for digit or separator
-        (?P<precision>[0-9]+)?
+        (?=[\d,_])  # lookahead for digit or separator
+        (?P<precision>\d+)?
         (?P<frac_separators>[,_])?
     )?
     (?P<presentation_type>[eEfFgG%])

Lib/test/test_fractions.py

@@ -1326,6 +1326,8 @@ def test_format_e_presentation_type(self):
             (F('1234567.123456'), '.5_e', '1.234_57e+06'),
             # z flag is legal, but never makes a difference to the output
             (F(-1, 7**100), 'z.6e', '-3.091690e-85'),
+            # Accept unicode in width and precision
+            (F(22, 7), '١١.٦e', '3.142857e+00'),
         ]
         for fraction, spec, expected in testcases:
             with self.subTest(fraction=fraction, spec=spec):
@@ -1525,6 +1527,8 @@ def test_format_f_presentation_type(self):
             (F(151, 1000), '.1f', '0.2'),
             (F(22, 7), '.02f', '3.14'),  # issue gh-130662
             (F(22, 7), '005.02f', '03.14'),
+            # Accept unicode in width and precision
+            (F(22, 7), '٧.٢f', '   3.14'),
         ]
         for fraction, spec, expected in testcases:
             with self.subTest(fraction=fraction, spec=spec):

Misc/NEWS.d/next/Library/2025-10-27-09-36-13.gh-issue-135025.fIkmSz.rst

@@ -0,0 +1,2 @@
+Allow unicode digits for width and precision fields of format specifications
+of :class:`fractions.Fraction`.  Patch by Sergey B Kirpichev.