hgext/convert/git.py

--- a/hgext/convert/git.py	Sat May 06 04:51:25 2017 +0530
+++ b/hgext/convert/git.py	Fri Feb 10 16:56:29 2017 -0800
@@ -32,7 +32,7 @@
         return "%s %s" % (self.node, self.path)
 
 # Keys in extra fields that should not be copied if the user requests.
-bannedextrakeys = set([
+bannedextrakeys = {
     # Git commit object built-ins.
     'tree',
     'parent',
@@ -41,7 +41,7 @@
     # Mercurial built-ins.
     'branch',
     'close',
-])
+}
 
 class convert_git(common.converter_source, common.commandline):
     # Windows does not support GIT_DIR= construct while other systems
@@ -455,9 +455,9 @@
             ('refs/heads/', '')
         ]
 
-        exclude = set([
+        exclude = {
             'refs/remotes/origin/HEAD',
-        ])
+        }
 
         try:
             output, status = self.gitrunlines('show-ref')