Cheryl Sabella <> added the comment:

I believe this has been added to the 3.4 What's New already:

object.__format__() no longer accepts non-empty format strings, it now raises a 
TypeError instead. Using a non-empty string has been deprecated since Python 
3.2. This change has been made to prevent a situation where previously working 
(but incorrect) code would start failing if an object gained a __format__ 
method, which means that your code may now raise a TypeError if you are using 
an 's' format code with objects that do not have a __format__ method that 
handles it. See bpo-7994 for background

Closing as resolved.

nosy: +csabella
resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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