--- a/hgext3rd/topic/topicmap.py	Tue Aug 06 15:06:27 2019 +0200
+++ b/hgext3rd/topic/topicmap.py	Tue Aug 06 15:06:38 2019 +0200
@@ -16,22 +16,22 @@
     common,
 )
 
-basefilter = set(['base', 'immutable'])
+basefilter = set([b'base', b'immutable'])
 def topicfilter(name):
     """return a "topic" version of a filter level"""
     if name in basefilter:
         return name
     elif name is None:
         return None
-    elif name.endswith('-topic'):
+    elif name.endswith(b'-topic'):
         return name
     else:
-        return name + '-topic'
+        return name + b'-topic'
 
 def istopicfilter(filtername):
     if filtername is None:
         return False
-    return filtername.endswith('-topic')
+    return filtername.endswith(b'-topic')
 
 def gettopicrepo(repo):
     if not common.hastopicext(repo):
@@ -61,8 +61,8 @@
         if newfilter not in funcmap:
             funcmap[newfilter] = revsfunc
             partialmap[newfilter] = base
-    funcmap['unfiltered-topic'] = lambda repo: frozenset()
-    partialmap['unfiltered-topic'] = 'visible-topic'
+    funcmap[b'unfiltered-topic'] = lambda repo: frozenset()
+    partialmap[b'unfiltered-topic'] = b'visible-topic'
 
 def _phaseshash(repo, maxrev):
     """uniq ID for a phase matching a set of rev"""
@@ -80,7 +80,7 @@
     if revs:
         s = hashlib.sha1()
         for rev in revs:
-            s.update('%d;' % rev)
+            s.update(b'%d;' % rev)
         key = s.digest()
     return key
 
@@ -100,7 +100,7 @@
     # wrap commit status use the topic branch heads
     ctx = repo[node]
     if ctx.topic() and ctx.branch() == branch:
-        bheads = repo.branchheads("%s:%s" % (branch, ctx.topic()))
+        bheads = repo.branchheads(b"%s:%s" % (branch, ctx.topic()))
 
     ret = orig(repo, node, branch, bheads=bheads, opts=opts)
 
@@ -113,8 +113,8 @@
 
     if (not opts.get(b'amend') and bheads and node not in bheads and not
         [x for x in parents if x.node() in bheads and x.branch() == branch]):
-        repo.ui.status(_("(consider using topic for lightweight branches."
-                         " See 'hg help topic')\n"))
+        repo.ui.status(_(b"(consider using topic for lightweight branches."
+                         b" See 'hg help topic')\n"))
 
     return ret
 
@@ -179,17 +179,17 @@
         new.phaseshash = self.phaseshash
         return new
 
-    def branchtip(self, branch, topic=''):
+    def branchtip(self, branch, topic=b''):
         '''Return the tipmost open head on branch head, otherwise return the
         tipmost closed head on branch.
         Raise KeyError for unknown branch.'''
         if topic:
-            branch = '%s:%s' % (branch, topic)
+            branch = b'%s:%s' % (branch, topic)
         return super(_topiccache, self).branchtip(branch)
 
-    def branchheads(self, branch, closed=False, topic=''):
+    def branchheads(self, branch, closed=False, topic=b''):
         if topic:
-            branch = '%s:%s' % (branch, topic)
+            branch = b'%s:%s' % (branch, topic)
         return super(_topiccache, self).branchheads(branch, closed=closed)
 
     def validfor(self, repo):
@@ -229,13 +229,13 @@
 
         def branchinfo(r, changelog=None):
             info = oldgetbranchinfo(r)
-            topic = ''
+            topic = b''
             ctx = unfi[r]
             if ctx.mutable():
                 topic = ctx.topic()
             branch = info[0]
             if topic:
-                branch = '%s:%s' % (branch, topic)
+                branch = b'%s:%s' % (branch, topic)
             return (branch, info[1])
         try:
             unfi.revbranchcache().branchinfo = branchinfo