Mark Dickinson <dicki...@gmail.com> added the comment:

Yes, confirmed that this is not a bug, but just one of the many consequences of 
approximating real numbers by floating-point numbers.

You may be interested in math.log2 and/or int.bit_length. math.log2(x) *may*  
give you more accurate results than math.log(x, 2) when x is a power of two, 
but there are no guarantees - we're at the mercy of the C math library here.

----------
nosy: +mark.dickinson
resolution:  -> not a bug

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46144>
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