def punycode_url(self):
"""
Convert url to punycode if necessary.
"""
hostname = original = self.netloc_parts[2]
hostname = hostname.strip('.')
while '..' in hostname:
hostname = hostname.replace('..', '.')
punycode = hostname.encode('idna').decode('ascii')
if punycode == original:
return
self.netloc_parts[2] = punycode
self.url_parts[1] = unsplit_netloc(self.netloc_parts)
self.cleaned_data['url'] = urlparse.urlunsplit(self.url_parts)