[PATCH 8 of 8] py3: use pycompat.bytestr() to convert str to bytes

[Pulkit Goyal]

# HG changeset patch
# User Pulkit Goyal <7895pulkit at gmail.com>
# Date 1498501707 -19800
#      Mon Jun 26 23:58:27 2017 +0530
# Node ID f4f483472ca87678a006a8224a5e14495ed7f889
# Parent  e53b2097c1368e99088dc573225dd02b05dc5b0f
py3: use pycompat.bytestr() to convert str to bytes

diff --git a/mercurial/debugcommands.py b/mercurial/debugcommands.py
--- a/mercurial/debugcommands.py
+++ b/mercurial/debugcommands.py
@@ -1884,7 +1884,7 @@
     def fmtchunktype(chunktype):
         if chunktype == 'empty':
             return '    %s     : ' % chunktype
-        elif chunktype in string.ascii_letters:
+        elif chunktype in pycompat.bytestr(string.ascii_letters):
             return '    0x%s (%s)  : ' % (hex(chunktype), chunktype)
         else:
             return '    0x%s      : ' % hex(chunktype)