--- a/mercurial/txnutil.py	Sat Oct 05 10:29:34 2019 -0400
+++ b/mercurial/txnutil.py	Sun Oct 06 09:45:02 2019 -0400
@@ -9,9 +9,8 @@
 
 import errno
 
-from . import (
-    encoding,
-)
+from . import encoding
+
 
 def mayhavepending(root):
     '''return whether 'root' may have pending changes, which are
@@ -19,6 +18,7 @@
     '''
     return root == encoding.environ.get('HG_PENDING')
 
+
 def trypending(root, vfs, filename, **kwargs):
     '''Open  file to be read according to HG_PENDING environment variable