--- a/mercurial/graphmod.py	Wed Aug 01 12:57:15 2018 -0700
+++ b/mercurial/graphmod.py	Wed Aug 01 13:00:45 2018 -0700
@@ -22,6 +22,7 @@
 from .node import nullrev
 from . import (
     dagop,
+    pycompat,
     smartset,
     util,
 )
@@ -426,16 +427,16 @@
     # shift_interline is the line containing the non-vertical
     # edges between this entry and the next
     shift_interline = echars[:idx * 2]
-    for i in xrange(2 + coldiff):
+    for i in pycompat.xrange(2 + coldiff):
         shift_interline.append(' ')
     count = ncols - idx - 1
     if coldiff == -1:
-        for i in xrange(count):
+        for i in pycompat.xrange(count):
             shift_interline.extend(['/', ' '])
     elif coldiff == 0:
         shift_interline.extend(echars[(idx + 1) * 2:ncols * 2])
     else:
-        for i in xrange(count):
+        for i in pycompat.xrange(count):
             shift_interline.extend(['\\', ' '])
 
     # draw edges from the current node to its parents