Frank Sievertsen <pyt...@sievertsen.de> added the comment:

> The suffix only introduces a constant change in all hash values
> output, so even if you don't know the suffix, you can still
> generate data sets with collisions by just having the prefix.

That's true. But without the suffix, I can pretty easy and efficient guess the 
prefix by just seeing the result of a few well-chosen and short repr(dict(X)). 
I suppose that's harder with the suffix.

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<http://bugs.python.org/issue13703>
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