Antoine Pitrou added the comment:
Well, the quality of the hash function is clearly reduced:
>>> hash("abcdefgh") & 0xff
206
>>> hash("abcdefgi") & 0xff
206
>>> hash("abcdefgj") & 0xff
206
>>> hash("abxxxxxx") & 0xff
206
>>> hash("aaaaaa11") & 0xff
206
>>> hash("aaaaaa12") & 0xff
206
Now to know if that may produce slowdowns in some situations... (dicts and sets
have a sophisticated probing algorithm which takes into account the whole hash
value, not the masked one).
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<http://bugs.python.org/issue16427>
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