[issue13410] String formatting bug in interactive mode

[Armin Rigo]

Armin Rigo <arigo at users.sourceforge.net> added the comment:

Fwiw, a class with methods __long__ and __float__ but no method __int__ behaves strangely in many other places; the canonical example is that calling "int(Foo(42))" will not work.  In light of this, does it make sense for "'%d' % Foo(42)" to work?  Shouldn't the fix instead be to cleanly raise the TypeError instead?

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nosy: +arigo

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<http://bugs.python.org/issue13410>
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