gh-139374: colorize timeit error traceback

Lib/test/test_timeit.py

@@ -4,7 +4,7 @@
 import io
 from textwrap import dedent
 
-from test.support import captured_stdout
+from test.support import captured_stdout, force_not_colorized
 from test.support import captured_stderr
 
 # timeit's default number of iterations.
@@ -225,6 +225,7 @@ def assert_exc_string(self, exc_string, expected_exc_name):
         self.assertStartsWith(exc_lines[0], 'Traceback')
         self.assertStartsWith(exc_lines[-1], expected_exc_name)
 
+    @force_not_colorized
     def test_print_exc(self):
         s = io.StringIO()
         t = timeit.Timer("1/0")
@@ -351,11 +352,13 @@ def test_main_with_time_unit(self):
         self.assertEqual(error_stringio.getvalue(),
                     "Unrecognized unit. Please select nsec, usec, msec, or sec.\n")
 
+    @force_not_colorized
     def test_main_exception(self):
         with captured_stderr() as error_stringio:
             s = self.run_main(switches=['1/0'])
         self.assert_exc_string(error_stringio.getvalue(), 'ZeroDivisionError')
 
+    @force_not_colorized
     def test_main_exception_fixed_reps(self):
         with captured_stderr() as error_stringio:
             s = self.run_main(switches=['-n1', '1/0'])

Lib/timeit.py

@@ -150,15 +150,16 @@ def print_exc(self, file=None):
         The optional file argument directs where the traceback is
         sent; it defaults to sys.stderr.
         """
-        import linecache, traceback
+        import _colorize, linecache, traceback, sys
         if self.src is not None:
             linecache.cache[dummy_src_name] = (len(self.src),
                                                None,
                                                self.src.split("\n"),
                                                dummy_src_name)
         # else the source is already stored somewhere else
 
-        traceback.print_exc(file=file)
+        traceback.print_exception(sys.exception(), file=file,
+                                 colorize=_colorize.can_colorize(file=file))
 
     def timeit(self, number=default_number):
         """Time 'number' executions of the main statement.

Misc/NEWS.d/next/Library/2025-09-27-08-26-31.gh-issue-139374.hfh-dl.rst

@@ -0,0 +1 @@
+:mod:`timeit`: colorize error tracebacks.