diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -851,6 +851,12 @@ class localrepository(object):
             f = f[1:]
         return filelog.filelog(self.svfs, f)
 
+    def parents(self, changeid=None):
+        '''get list of changectxs for parents of changeid'''
+        msg = 'repo.parents() is deprecated, use repo[%r].parents()' % changeid
+        self.ui.deprecwarn(msg, '3.7')
+        return self[changeid].parents()
+
     def changectx(self, changeid):
         return self[changeid]