On Fri, Aug 27, 2021 at 1:15 PM Finn Mason <finnjavie...@gmail.com> wrote:
>
> > Is this too magical?
> > result = run('cat file.txt') | run('sort) | run('grep hello',
> > capture_output=True, text=True).stdout
>
> Interesting idea, especially overloading the union/pipe operator (|). I like
> it a lot. It reminds me of pathlib.Path (which is a wonderful tool), with its
> slash operator overload.
> Python is supposed to be easy to read and understand, and anything that makes
> complicated system stuff less messy is welcome, I think.
It's perfectly legal to do this sort of thing, but it doesn't really
belong in the stdlib (more on that later).
> Another idea (which I am less in favor of) is a more functional approach,
> like:
>
> run('grep hello', run('sort', run('cat file.txt')))
>
That's a bit more viable. I'd be inclined to have a keyword argument
here, for instance:
run('grep hello', stdin=run('sort', sttdin=run('cat file.txt')))
but I agree, it makes good sense to have an argument able to take a
variety of data types, including another program's output.
But Python isn't a language that needs everything to be done with
command invocations and pipes. If you're doing long pipelines like
this, there's probably something wrong. Why use external programs to
do things that Python can do far more viably itself?
with open('file.txt') as f:
result = [l.strip("\r\n") for l in sorted(f) if "hello" in l]
Trying to make a more Pythonic syntax for an operation that Python
does better in a completely different way is a bit of a half-hearted
solution. I'd recommend either sticking to a full "run the shell and
hand it this command line", or going the whole way and doing the job
in Python.
ChrisA
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