Hi Chuck On Sun, Jun 25, 2017, at 09:32, Charles R Harris wrote: > The boolean binary '-' operator was deprecated back in NumPy 1.9 and > changed to an error in 1.13. This caused a number of failures in > downstream projects. The choices now are to continue the deprecation > for another couple of releases, or simply give up on the change. For > booleans, `a - b` was implemented as `a xor b`, which leads to the > somewhat unexpected identity `a - b == b - a`, but it is a handy > operator that allows simplification of some functions, `numpy.diff` > among therm. At this point I'm inclined to give up on the deprecation > and retain the old behavior. It is a bit impure but perhaps we can > consider it a feature rather than a bug. What was the original motivation behind the deprecation? `xor` seems like exactly what one would expect when subtracting boolean arrays. But, in principle, I'm not against the deprecation (we've had to fix a few problems that arose in skimage, but nothing big). Stéfan
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