>>>
urllib.urlencode(cgi.parse_qsl('ext=.jpg&outquality=56'))
'ext=.jpg&outquality=56'
>>>
urllib.urlencode(cgi.parse_qs('ext=.jpg&outquality=56'))
'ext=%5B%27.jpg%27%5D&outquality=%5B%2756%27%5D'

"%5B%27" = "['"

 

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As per the urlencode() API documentation, you are passing in 
sequences, so you need to set the doseq flag.

>>> urllib.urlencode(cgi.parse_qs
('ext=.jpg&outquality=56'),doseq=1)
'ext=.jpg&outquality=56'

I recommend that this bug report be closed as Invalid.

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Can you name one web app that you know will take args in the
form of "ext=[27.jpg]"?  Why not do some type inspection to
see what types you are dealing with?  What is the use of
encoding a list in a url using python syntax?

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I am only guessing, here, but if you had an object that you 
wanted to embed a representation of in a URL or in HTML 
form data, it would be prudent to call str() on the object and 
let its __str__ method give you a string representation, and 
then you'd percent-encode that. This makes sense for user-
defined classes, where you can define __str__, but not for 
built-in types like an ordinary list, so they give you the doseq 
flag for those situations.

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Ok... closing