To me that looks super easy to read. You just go left to right.

    for y in z:
        for x in zz:
            if y in x:
                yield x

It’s extremely easy to sight read. If the lines become long, just split them up and it’s even more obvious.

    [x
     for y in z
     for x in zz
     if y in x]

There’s nothing tricky about multiple loops and conditions in comprehensions in most languages that support them. Just go left to right and it mirrors outer to inner loops/conditionals.

Agree.

Also, most data scientists presumably have some advanced math background so it's akin to reading set-builder notation (albeit with listcomps the sets are sometimes nested). Your listcomp reads:

{x : y ∈ z, x ∈ zz | y ∈ x}

If you've read enough statistics/ML papers, this becomes second nature.

> If you've read enough statistics/ML papers, this becomes second nature.

As someone who breathes that style of notation, there is excellent support in vim and emacs for custom display for readability. Conceal syntax in vim¹(builtin for rust/help/$few_others and external such as vim-cute-python²), and pretty-mode³ in emacs. I'm sure similar things exist in other editors too, but I don't use those ;)

You don't get the exact representation in your example with the things I've mentioned, but if you're used to a more "mathy"-style they really are quite nice. YM[and taste]MV.

1. http://vimdoc.sourceforge.net/htmldoc/syntax.html#conceal

2. https://github.com/ehamberg/vim-cute-python (moresymbols branch for er… more symbols)

3. https://github.com/akatov/pretty-mode

Interesting. I didn't know that!