HTML Email using Python

We created a module called sendmail which email html content. Each of application dumps data from the datastructure into html format and then calls this module

def createhtmlmail( html, text, subject ):
   """Create a mime-message that will render HTML in popular
      MUAs, text in better ones"""
   import MimeWriter
   import mimetools
   import cStringIO

   out = cStringIO.StringIO() # output buffer for our message
   htmlin = cStringIO.StringIO(html)

   writer = MimeWriter.MimeWriter(out)
#
# set up some basic headers... we put subject here
# because smtplib.sendmail expects it to be in the
# message body
#
   
   writer.addheader("Subject", subject)
   writer.addheader("MIME-Version", "1.0")
#
# start the multipart section of the message
# multipart/alternative seems to work better
# on some MUAs than multipart/mixed
#
   writer.startmultipartbody("alternative")
   writer.flushheaders()
#
# the plain text section
#
   if text != None:
      txtin = cStringIO.StringIO(text)
      subpart = writer.nextpart()
      subpart.addheader("Content-Transfer-Encoding", "quoted-printable")
      pout = subpart.startbody("text/plain", [("charset", 'us-ascii')])
      mimetools.encode(txtin, pout, 'quoted-printable')
      txtin.close()
#
# start the html subpart of the message
#
   subpart = writer.nextpart()
   subpart.addheader("Content-Transfer-Encoding", "quoted-printable")
#
# returns us a file-ish object we can write to
#
   pout = subpart.startbody("text/html", [("charset", 'us-ascii')])
   mimetools.encode(htmlin, pout, 'quoted-printable')
   htmlin.close()
#
# Now that we're done, close our writer and
# return the message body
#
   writer.lastpart()
   msg = out.getvalue()
   out.close()
   #print msg
   return msg

def sendmail (sender,to,subject,htmlFilename):
   import smtplib
   f = open(htmlFilename, 'r')
   html = f.read()
   f.close()
   message = createhtmlmail(html, None, subject)
   server = smtplib.SMTP("mta-hub")
   server.sendmail(sender, to, message)
   server.quit()