# HG changeset patch
# User Pulkit Goyal <7895pulkit@gmail.com>
# Date 2016-05-17 00:02:36
# Node ID bac14dbbbfab840cb683f842ba52d959f5585ff7
# Parent  ad1ce3c7af720c8034b84416a9951553af2fcfcb

py3: use setattr() to assign new class attribute

The old method produces error 'object does not supports item assignment'.
So setattr() is used to assign a new class attribute via __dict__ .

diff --git a/mercurial/mail.py b/mercurial/mail.py
--- a/mercurial/mail.py
+++ b/mercurial/mail.py
@@ -41,7 +41,7 @@ def _unifiedheaderinit(self, *args, **kw
     kw['continuation_ws'] = ' '
     _oldheaderinit(self, *args, **kw)
 
-email.Header.Header.__dict__['__init__'] = _unifiedheaderinit
+setattr(email.header.Header, '__init__', _unifiedheaderinit)
 
 class STARTTLS(smtplib.SMTP):
     '''Derived class to verify the peer certificate for STARTTLS.