How to make case insensitive filter queries with Google App Engine?

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I am working on a GAE Django Project where I have to implementing the search functionality, I have written a query and it fetches the data according to the search keyword.

portfolio = Portfolio.all().filter('full_name >=',key).filter('full_name <',unicode(key) + u'\ufffd')

The issue with this query is, that it is case sensitive.

Is there any way through which I can make it to work, without depending upon the case of the keyword?

Please suggest.

Thanks in advance.

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