Serhiy Storchaka added the comment:

str.format() uses PyDict_GetItem() in 2.7, but PyObject_GetItem() in 3.x. A 
comment before:

        /* Use PyObject_GetItem instead of PyDict_GetItem because this
           code is no longer just used with kwargs. It might be passed
           a non-dict when called through format_map. */

Thus the behavior of str.format() was changed by accident.

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<http://bugs.python.org/issue18531>
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