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imankulov/bitmapist_workaround.py

Created February 23, 2017 19:13
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Workaround for broken "foo AND NOT bar" logic in bitmapist
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bitmapist_workaround.py
>>> bitmapist.mark_unique('foo', 1)
>>> bitmapist.mark_unique('foo', 1000)
>>> bitmapist.mark_unique('bar', 1)
>>> list(bitmapist.UniqueEvents('foo') & ~bitmapist.UniqueEvents('bar'))
[]
>>> list(bitmapist.UniqueEvents('foo') ^ bitmapist.UniqueEvents('bar') & bitmapist.UniqueEvents('foo'))
[1000]
@imankulov
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Expressions of type a AND NOT b don't work as expected in bitmapist, because b may not be of the same size as a. The thing is, a AND NOT b is an equivalent for a XOR b AND a which works just fine.

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