INADA Naoki <songofaca...@gmail.com> added the comment:

Even if we fixed stdlib, there are many KeyError(missing) idiom used in 3rd 
party code.

KeyError: '42'
KeyError: '42\n'
KeyError: 42

All of the above are looks different.  I think it's good.
Is it really worth enough to break it?

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nosy: +inada.naoki

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