gh-145269: simplify bisect.bisect doc example (#145270)

Co-authored-by: Pieter Eendebak <pieter.eendebak@gmail.com>

---------

Co-authored-by: Pieter Eendebak <pieter.eendebak@gmail.com>

Author: ngoldbaum

Doc/library/bisect.rst

@@ -200,9 +200,9 @@ example uses :py:func:`~bisect.bisect` to look up a letter grade for an exam sco
 based on a set of ordered numeric breakpoints: 90 and up is an 'A', 80 to 89 is
 a 'B', and so on::
 
-   >>> def grade(score, breakpoints=[60, 70, 80, 90], grades='FDCBA'):
-   ...     i = bisect(breakpoints, score)
-   ...     return grades[i]
+   >>> def grade(score)
+   ...     i = bisect([60, 70, 80, 90], score)
+   ...     return "FDCBA"[i]
    ...
    >>> [grade(score) for score in [33, 99, 77, 70, 89, 90, 100]]
    ['F', 'A', 'C', 'C', 'B', 'A', 'A']

Lib/test/test_bisect.py

@@ -391,9 +391,9 @@ class TestErrorHandlingC(TestErrorHandling, unittest.TestCase):
 
 class TestDocExample:
     def test_grades(self):
-        def grade(score, breakpoints=[60, 70, 80, 90], grades='FDCBA'):
-            i = self.module.bisect(breakpoints, score)
-            return grades[i]
+        def grade(score):
+            i = self.module.bisect([60, 70, 80, 90], score)
+            return "FDCBA"[i]
 
         result = [grade(score) for score in [33, 99, 77, 70, 89, 90, 100]]
         self.assertEqual(result, ['F', 'A', 'C', 'C', 'B', 'A', 'A'])