diff -r 15d3facfa40a -r aaad36b88298 contrib/debugshell.py
--- a/contrib/debugshell.py	Sun Jan 13 20:13:22 2019 -0500
+++ b/contrib/debugshell.py	Wed Feb 20 19:28:51 2019 -0500
@@ -34,9 +34,9 @@
 
 @command('debugshell|dbsh', [])
 def debugshell(ui, repo, **opts):
-    bannermsg = "loaded repo : %s\n" \
-                "using source: %s" % (repo.root,
-                                      mercurial.__path__[0])
+    bannermsg = ("loaded repo : %s\n"
+                 "using source: %s" % (repo.root,
+                                       mercurial.__path__[0]))
 
     pdbmap = {
         'pdb'  : 'code',