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

[anil maran]

    text = """From: the bugman <y...@example.com>
To: the bugfixer <y...@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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