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exact and contains are quite different. We could say exact is a subset of contains.
Your title field could contain 'Django', but the title itself isn’t 'Django', so exact or iexact fails.
e.g.
title = 'Django: the framework for perfectionists with deadlines'
Works for contains but fails for [i]exact.
If you’re looking for case-insentive containment, then icontains is what you want.
Source:stackexchange.com