--- a/mercurial/shelve.py	Fri Nov 27 17:00:00 2020 -0500
+++ b/mercurial/shelve.py	Fri Nov 27 17:03:29 2020 -0500
@@ -350,8 +350,7 @@
 
 
 def _aborttransaction(repo, tr):
-    '''Abort current transaction for shelve/unshelve, but keep dirstate
-    '''
+    """Abort current transaction for shelve/unshelve, but keep dirstate"""
     dirstatebackupname = b'dirstate.shelve'
     repo.dirstate.savebackup(tr, dirstatebackupname)
     tr.abort()