easy way to change a dict data to url Parameter

(1)

a={'b':'bbbb','c':'ccc',....}

(2)

self.redirect('/tribes/view?b=' + a['b'] + '&c=' + a['c'])

so i want to get

b=' + a['b'] + '&c=' + a['c'] ...

from dict a

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hae any easy way to do this ?

thanks

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from urllib import urlencode
urlencode({'b':'bbbb', 'c':'ccc'})