--- a/mercurial/txnutil.py	Fri Nov 27 17:00:00 2020 -0500
+++ b/mercurial/txnutil.py	Fri Nov 27 17:03:29 2020 -0500
@@ -13,20 +13,20 @@
 
 
 def mayhavepending(root):
-    '''return whether 'root' may have pending changes, which are
+    """return whether 'root' may have pending changes, which are
     visible to this process.
-    '''
+    """
     return root == encoding.environ.get(b'HG_PENDING')
 
 
 def trypending(root, vfs, filename, **kwargs):
-    '''Open  file to be read according to HG_PENDING environment variable
+    """Open  file to be read according to HG_PENDING environment variable
 
     This opens '.pending' of specified 'filename' only when HG_PENDING
     is equal to 'root'.
 
     This returns '(fp, is_pending_opened)' tuple.
-    '''
+    """
     if mayhavepending(root):
         try:
             return (vfs(b'%s.pending' % filename, **kwargs), True)