4 ms·

They're great until you find something like this in code: [x for y in z for x in zz if y in x] Then you begin to wonder how great they really are.

mlthoughts2018 6y ago
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.
- xushiwei 6y ago
  Agree.
wenc 6y ago
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.
- JNRowe 6y ago
  > 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 http://vimdoc.sourceforge.net/htmldoc/syntax.html#conceal 2. https://github.com/ehamberg/vim-cute-python https://github.com/ehamberg/vim-cute-python (moresymbols branch for er… more symbols) 3. https://github.com/akatov/pretty-mode https://github.com/akatov/pretty-mode
- ascotan 6y ago
  Interesting. I didn't know that!

mlthoughts2018 6y ago

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.

xushiwei 6y ago
Agree.

wenc 6y ago

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.

JNRowe 6y ago
> 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 http://vimdoc.sourceforge.net/htmldoc/syntax.html#conceal 2. https://github.com/ehamberg/vim-cute-python https://github.com/ehamberg/vim-cute-python (moresymbols branch for er… more symbols) 3. https://github.com/akatov/pretty-mode https://github.com/akatov/pretty-mode
ascotan 6y ago
Interesting. I didn't know that!