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Here is a patch based on Matthew's patch. It is smaller (+35 lines vs +59) but fixes error messages for more cases:
int(b'1230円') -- bytes string with null without base.
int(b'123\xbd') -- non-utf-8 bytes string.
int('123\ud800') -- lone surrogate in unicode string.
Unfortunately it is not easy to backport it to 2.7. PyErr_Format() in 2.7 works only with null-terminated strings. I propose to fix this issue on 3.3+ and declare it as "won't fix" for 2.7.