[issue19915] int.bit_at(n) - Accessing a single bit in O(1)

[anon]

anon added the comment:

I think the case where i is negative can be handled by

bits_at(i, pos, width) = bits_at(~i, pos, width) ^ ((1 << width) - 1)

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<http://bugs.python.org/issue19915>
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