* testing with the test_ops pattern
* add assign test
* flake8 complaining about single line fn
* slice 2d and minor cleanup
* make assign_slice a one-liner
* we dont need to repeat the same lambda twice, default tinygrad_fxn to be np_fxn
* back assign fn for np array
* implement __setitem__ in tensor.py
* dont re-slice the ret tesnsor
* one liner assign
* drop the permute test
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