--- a/mercurial/dispatch.py	Mon Oct 02 19:25:11 2017 -0700
+++ b/mercurial/dispatch.py	Fri Sep 29 15:48:34 2017 +0000
@@ -243,10 +243,10 @@
         try:
             debugger = 'pdb'
             debugtrace = {
-                'pdb' : pdb.set_trace
+                'pdb': pdb.set_trace
             }
             debugmortem = {
-                'pdb' : pdb.post_mortem
+                'pdb': pdb.post_mortem
             }
 
             # read --config before doing anything else