Eric V. Smith added the comment:
I left a comment on Rietveld, but repeating it here because for me those
messages often go to spam:
I think you want to make this more general, by modifying the message for the
TypeError that follows. Any type that doesn't provide it's own __format__
should produce an error when using a non-empty format string.
For example:
>>> format({}, 'a')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: non-empty format string passed to object.__format__
Would be better as:
TypeError: non-empty format string passed to __format__ for object of type
"class <'dict'>"
(Or some prettier way to print out the type).
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<http://bugs.python.org/issue28385>
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