--- a/hgext3rd/evolve/depthcache.py	Wed Jul 03 11:13:47 2019 -0700
+++ b/hgext3rd/evolve/depthcache.py	Tue Jul 09 10:56:42 2019 -0700
@@ -35,12 +35,12 @@
     return len(repo.revs('::%d', rev))
 
 @eh.command(
-    'debugdepth',
+    b'debugdepth',
     [
-        ('r', 'rev', [], 'revs to print depth for'),
-        ('', 'method', 'cached', "one of 'simple', 'cached', 'compare'"),
+        (b'r', b'rev', [], b'revs to print depth for'),
+        (b'', b'method', b'cached', b"one of 'simple', 'cached', 'compare'"),
     ],
-    _('REVS'))
+    _(b'REVS'))
 def debugdepth(ui, repo, **opts):
     """display depth of REVS
     """