On Wed, 1 Sept 2021 at 01:20, Matthias Bussonnier < bussonniermatth...@gmail.com> wrote:
> > Are there other such classes? > [snip] > ... stuff, let's pick a few: > > sympy.physics.optics.Medium: > > def __eq__(self, other): > return self.refractive_index == other.refractive_index > > Will crash with None has no attribute refractive_index, > I think that particular __eq__ method is buggy. There should be a general expectation that __eq__ can be used with unexpected types and should return NotImplemented or False rather than raise an exception. Oscar
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