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why not use namedtuples (or plain tuples) instead of dictionaries?

Dicts are the fastest dynamic structure out of the box. Tuples will bite you with immutability sooner or later.

I usually think of immutability in terms of saving myself from getting bitten :-)

Touché! Thats a nice thought, however string concatenation with the += operator inside a loop is the kind of bite I was thinking about.