Let's say I have an sqlalchemy.Table object t (bound to MetaData bound to an engine with an open connection) with a composite primary key defined (so t.primary_key() returns an object of type PrimaryKeyConstraint), and I also have a tuple that represents a specific value of that primary key. What is the tersest code (briefest + most elegant) to perform a lookup for a row identified by that key, which will return at most one object, or None if no such row exists?
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