Zach Price

### What did you do? Let's play around with image dithering, starting with this nice, low-res picture of Theresa May:  According to the [docs](https://pillow.readthedocs.io/en/stable/reference/Image.html#PIL.Image.Image.convert) calling `convert` in "P" mode...

Indexed object support

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SymPy provides support for indexed symbolic objects, i.e. vector or matrix variables. This is often useful when, say, taking partials with respect to different elements of some vector argument. Are...

Passing locals dict to sympify

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When constructing an expression from a string in SymPy, it is often useful to pass around a `locals` dict defining necessary symbols. This functionality is present in `sympy.sympify` via the...