[Python] urlencode an array of values

I'm trying to urlencode an dictionary in python with urllib.urlencode. The problem is, I have to encode an array.

The result needs to be:

criterias%5B%5D=member&criterias%5B%5D=issue
#unquoted: criterias[]=member&criterias[]=issue


But the result I get is:

criterias=%5B%27member%27%2C+%27issue%27%5D
#unquoted: criterias=['member',+'issue']


I have tried several things, but I can't seem to get the right result.

import urllib
criterias = ['member', 'issue']
params = {
'criterias[]': criterias,
}
print urllib.urlencode(params)


If I use cgi.parse_qs to decode a correct query string, I get this as result:

{'criterias[]': ['member', 'issue']}


But if I encode that result, I get a wrong result back. Is there a way to produce the expected result?

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