Future Of Technology - Django

import urllib

def urldecode(query):
    d = {}
    a = query.split('&')
    for s in a:
        if s.find('='):
            k,v = map(urllib.unquote, s.split('='))
            try:
                 d[k].append(v)
            except KeyError:
                d[k] = [v]

     return d

s = 'Cat=1&by=down&start=1827&start=1234&anotherCat=me%3Dow%7e'
print urldecode(s)
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prints out following and preserves the order of inputs for those keys given more than once as with 'start' key
{'start': ['1827', '1234'], 'anotherCat': ['me=ow~'], 'by': ['down'], 'Cat': ['1']}