[issue12579] str.format_map raises a SystemError for non-mapping

[Julian]

Julian <Julian+Python.org at GrayVines.com> added the comment:

Yeah, I saw the line you suggested and didn't think that was it.

To expand on this, perhaps "{foo}".format(12) should raise a TypeError as well? I'd expect that more than the current behavior which is a KeyError. That KeyError is getting raised in get_field_object, which is where the fix needs to be, or at least needs to be changed, I'm just trying not to duplicate code.

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<http://bugs.python.org/issue12579>
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