Another disadvantage of calling str recursively rather than repr is that it places an onus on anyone writing a class to write both a repr and a str method (or be inconsistent with the newly-accepted standard for container types).
I personally write a repr method for most classes, which aids debugging. This means all my classes behave like containers currently do - their str will call repr on the items. This proposal will make all of my classes behave inconsistently with the standard container types. - Matt Giuca
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