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Showing content from https://mail.python.org/pipermail/python-dev/2012-January/115714.html below:

[Python-Dev] Counting collisions for the win

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> I'm surprised we haven't seen bug reports about it from users
> of 64-bit Pythons long ago

A Python dictionary only uses the lower bits of a hash value. If your
dictionary has less than 2**32 items, the dictionary order is exactly
the same on 32 and 64 bits system: hash32(str) & mask == hash64(str) &
mask for mask <= 2**32-1.

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