# -*- coding: utf-8 -*-

import urllib2

city = u'Köln'


def make_url(word):
    Word = unicode(word)
    print type(Word)
    url_Word = urllib2.quote(Word, "utf-8")
    print "ntype = %s n" %type(Word)
    print "url_word = %s n" %url_Word


make_url(city)

<type 'unicode'>

type = <type 'unicode'>

url_word = K%F6ln

<type 'unicode'>
C:Python27liburllib.py:1285: UnicodeWarning: Unicode equal comparison failed
to convert both arguments to Unicode - interpreting them as being unequal
  return ''.join(map(quoter, s))
Traceback (most recent call last):
  File "to_Ask_question.py", line 21, in <module>
    make_url(city)
  File "to_Ask_question.py", line 16, in make_url
    url_Word = urllib2.quote(Word, "utf-8")
  File "C:Python27liburllib.py", line 1285, in quote
    return ''.join(map(quoter, s))
KeyError: u'xf6'