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Mon Jul 28 12:58:05 CEST 2008 · https://mail.python.org/pipermail/python-dev/2008-July/081566.html

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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[Python-Dev] str(container) should call str(item), not repr(item)