--- a/tests/test-doctest.py	Sat Oct 05 10:29:34 2019 -0400
+++ b/tests/test-doctest.py	Sun Oct 06 09:45:02 2019 -0400
@@ -7,22 +7,30 @@
 import re
 import sys
 
-ispy3 = (sys.version_info[0] >= 3)
+ispy3 = sys.version_info[0] >= 3
 
 if 'TERM' in os.environ:
     del os.environ['TERM']
 
+
 class py3docchecker(doctest.OutputChecker):
     def check_output(self, want, got, optionflags):
         want2 = re.sub(r'''\bu(['"])(.*?)\1''', r'\1\2\1', want)  # py2: u''
         got2 = re.sub(r'''\bb(['"])(.*?)\1''', r'\1\2\1', got)  # py3: b''
         # py3: <exc.name>: b'<msg>' -> <name>: <msg>
         #      <exc.name>: <others> -> <name>: <others>
-        got2 = re.sub(r'''^mercurial\.\w+\.(\w+): (['"])(.*?)\2''', r'\1: \3',
-                      got2, re.MULTILINE)
+        got2 = re.sub(
+            r'''^mercurial\.\w+\.(\w+): (['"])(.*?)\2''',
+            r'\1: \3',
+            got2,
+            re.MULTILINE,
+        )
         got2 = re.sub(r'^mercurial\.\w+\.(\w+): ', r'\1: ', got2, re.MULTILINE)
-        return any(doctest.OutputChecker.check_output(self, w, g, optionflags)
-                   for w, g in [(want, got), (want2, got2)])
+        return any(
+            doctest.OutputChecker.check_output(self, w, g, optionflags)
+            for w, g in [(want, got), (want2, got2)]
+        )
+
 
 def testmod(name, optionflags=0, testtarget=None):
     __import__(name)
@@ -40,6 +48,7 @@
         runner.run(test)
     runner.summarize()
 
+
 testmod('mercurial.changegroup')
 testmod('mercurial.changelog')
 testmod('mercurial.cmdutil')