[Tutor] can you explain string replacement syntax and comma separated statements

[anil maran]

    text = """From: the bugman <y... at example.com> 
 To: the bugfixer <y... at example.com> 
 Subject: bug: %s: %s (%s) 
 Content-Type: multipart/mixed; boundary="----here----" 
 
------here---- 
 Content-Type: text/plain 
 Content-Disposition: inline 
 
%s 
 
%s 
 
------here---- 
 Content-Type: text/html; name="bug.html" 
 Content-Disposition: attachment; filename="bug.html" 
 
""" % (tb[0], tb[1], web.ctx.path, web.ctx.method+' '+web.ctx.home+web.ctx.f 
 ullpath, 
      ''.join(traceback.format_exception(*tb)), 
     text += str(web.djangoerror()) 



 		
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