[Solved] Float comparison (1.0 == 1.0) always false

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As others have stated, the problem is due to the way floating point numbers are stored. While you could try to use workarounds, there’s a better way to do this: Animation.

In __init__:

self.grid.opacity = 0
anim = Animation(opacity=1)
anim.start(self.grid)

solved Float comparison (1.0 == 1.0) always false