diff --git a/src/sage/doctest/control.py b/src/sage/doctest/control.py
index ba78f9bc2a6..60258b7bb1f 100644
--- a/src/sage/doctest/control.py
+++ b/src/sage/doctest/control.py
@@ -720,7 +720,7 @@ def load_stats(self, filename):
             sage: import json
             sage: filename = tmp_filename()
             sage: with open(filename, 'w') as stats_file:
-            ....:     json.dump({'sage.doctest.control':{'walltime':1.0r}}, stats_file)
+            ....:     json.dump({'sage.doctest.control': {'walltime': 1.0r}}, stats_file)
             sage: DC.load_stats(filename)
             sage: DC.stats['sage.doctest.control']
             {'walltime': 1.0}
@@ -755,7 +755,7 @@ def save_stats(self, filename):
 
             sage: from sage.doctest.control import DocTestDefaults, DocTestController
             sage: DC = DocTestController(DocTestDefaults(), [])
-            sage: DC.stats['sage.doctest.control'] = {'walltime':1.0r}
+            sage: DC.stats['sage.doctest.control'] = {'walltime': 1.0r}
             sage: filename = tmp_filename()
             sage: DC.save_stats(filename)
             sage: import json
@@ -1030,8 +1030,8 @@ def filter_sources(self):
             sage: DC = DocTestController(DD, [dirname])
             sage: DC.expand_files_into_sources()
             sage: for i, source in enumerate(DC.sources):
-            ....:     DC.stats[source.basename] = {'walltime': 0.1*(i+1)}
-            sage: DC.stats['sage.doctest.control'] = {'failed':True,'walltime':1.0}
+            ....:     DC.stats[source.basename] = {'walltime': 0.1r * (i+1)}
+            sage: DC.stats['sage.doctest.control'] = {'failed': True, 'walltime': 1.0r}
             sage: DC.filter_sources()
             Only doctesting files that failed last test.
             sage: len(DC.sources)
@@ -1061,7 +1061,7 @@ def sort_sources(self):
             sage: DC.expand_files_into_sources()
             sage: DC.sources.sort(key=lambda s:s.basename)
             sage: for i, source in enumerate(DC.sources):
-            ....:     DC.stats[source.basename] = {'walltime': 0.1*(i+1)}
+            ....:     DC.stats[source.basename] = {'walltime': 0.1r * (i+1)}
             sage: DC.sort_sources()
             Sorting sources by runtime so that slower doctests are run first....
             sage: print("\n".join(source.basename for source in DC.sources))
@@ -1202,7 +1202,7 @@ def cleanup(self, final=True):
             sage: DC.sources.sort(key=lambda s:s.basename)
 
             sage: for i, source in enumerate(DC.sources):
-            ....:     DC.stats[source.basename] = {'walltime': 0.1*(i+1)}
+            ....:     DC.stats[source.basename] = {'walltime': 0.1r * (i+1)}
             ....:
 
             sage: DC.run()
diff --git a/src/sage/doctest/forker.py b/src/sage/doctest/forker.py
index 3e5b4c52811..0175777614f 100644
--- a/src/sage/doctest/forker.py
+++ b/src/sage/doctest/forker.py
@@ -1369,7 +1369,7 @@ def report_success(self, out, test, example, got, *, check_duration=0):
             sage: FDS = FileDocTestSource(filename, DD)
             sage: doctests, extras = FDS.create_doctests(globals())
             sage: ex = doctests[0].examples[0]
-            sage: ex.walltime = 0.0
+            sage: ex.walltime = 0.0r
             sage: DTR.report_success(sys.stdout.write, doctests[0], ex, '1764')
             ok [0.00 s]
         """
@@ -1542,8 +1542,8 @@ def report_overtime(self, out, test, example, got, *, check_duration=0):
             sage: FDS = FileDocTestSource(filename, DD)
             sage: doctests, extras = FDS.create_doctests(globals())
             sage: ex = doctests[0].examples[0]
-            sage: ex.walltime = 1.23
-            sage: DTR.report_overtime(sys.stdout.write, doctests[0], ex, 'BAD ANSWER\n', check_duration=2.34)
+            sage: ex.walltime = 1.23r
+            sage: DTR.report_overtime(sys.stdout.write, doctests[0], ex, 'BAD ANSWER\n', check_duration=2.34r)
             **********************************************************************
             File ".../sage/doctest/forker.py", line 11, in sage.doctest.forker
             Warning, slow doctest:
@@ -1673,11 +1673,12 @@ def update_results(self, D):
             sage: DTR.run(doctests[0])
             TestResults(failed=0, attempted=4)
             sage: T.stop().annotate(DTR)
-            sage: D = DictAsObject({'cputime':[],'walltime':[],'err':None})
+            sage: D = DictAsObject({'cputime': [], 'walltime': [], 'err': None})
             sage: DTR.update_results(D)
             0
             sage: sorted(list(D.items()))
-            [('cputime', [...]), ('err', None), ('failures', 0), ('tests', 4), ('walltime', [...]), ('walltime_skips', 0)]
+            [('cputime', [...]), ('err', None), ('failures', 0), ('tests', 4),
+             ('walltime', [...]), ('walltime_skips', 0)]
         """
         for key in ["cputime", "walltime"]:
             if key not in D: