[issue28974] Make default __format__ be equivalent to __str__

[Serhiy Storchaka]

Serhiy Storchaka added the comment:


New changeset 7e19dbc92ec06a987eaae72f7cdfd32006aa4960 by Serhiy Storchaka in branch 'master':
bpo-28974: `object.__format__(x, '')` is now equivalent to `str(x)` (#506)
https://github.com/python/cpython/commit/7e19dbc92ec06a987eaae72f7cdfd32006aa4960


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<http://bugs.python.org/issue28974>
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