Re: Why does pathlib not have is_readable() & things like that?

From	Jussi Piitulainen <jussi.piitulainen@helsinki.fi>
Newsgroups	comp.lang.python
Subject	Re: Why does pathlib not have is_readable() & things like that?
Date	2016-04-29 14:51 +0300
Organization	A noiseless patient Spider
Message-ID	<lf5r3dor5ue.fsf@ling.helsinki.fi> (permalink)
References	(2 earlier) <mailman.106.1461679046.32212.python-list@python.org> <r8e9vcxf2a.ln2@news.ducksburg.com> <nft3h7$pbt$1@ger.gmane.org> <mailman.188.1461850479.32212.python-list@python.org> <manbvcxjkl.ln2@news.ducksburg.com>

Show all headers | View raw

Adam Funk writes:

> On 2016-04-28, Grant Edwards wrote:
>>
>> Then open the output file before you do the GET.
>
> I guess I could, but fetching the data actually involves a whole lot
> of GET requests (the first one includes cross-references to the URLs
> where the rest of the data is found), some BeautifulSoup processing, &
> a lot of other processing to produce a big dict, which I then write
> out as json using what I think is the best way (output_file is an
> instance of pathlib.Path):
>
>     with output_file.open(mode='w', encoding='UTF-8', errors='replace')  as f:
>         json.dump(output, f, sort_keys=True, indent=2)

It doesn't matter how much work it actually is. Make it conceptually a
single unit:

def get_output(): ...

with output_file.open(mode='w',
                      encoding='UTF-8',
                      errors='replace')  as f:
    output = get_output()
    json.dump(output, f,
              sort_keys=True,
              indent=2)

>> Or just do os.access("directory/where/you/want/to/open/a/file",os.W_OK)
>
> That's what I'm doing now, but I prefer to give the user the error
> message early on.

Then do that early on.

Thread

Why does pathlib not have is_readable() & things like that? Adam Funk <a24061@ducksburg.com> - 2016-04-26 14:30 +0100
  Re: Why does pathlib not have is_readable() & things like that? Random832 <random832@fastmail.com> - 2016-04-26 09:57 -0400
    Re: Why does pathlib not have is_readable() & things like that? Adam Funk <a24061@ducksburg.com> - 2016-04-28 14:02 +0100
      Re: Why does pathlib not have is_readable() & things like that? Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-04-28 16:24 +0300
      Re: Why does pathlib not have is_readable() & things like that? Grant Edwards <grant.b.edwards@gmail.com> - 2016-04-28 13:34 +0000
        Re: Why does pathlib not have is_readable() & things like that? Adam Funk <a24061@ducksburg.com> - 2016-04-29 10:49 +0100
          Re: Why does pathlib not have is_readable() & things like that? Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-04-29 14:51 +0300
            Re: Why does pathlib not have is_readable() & things like that? eryk sun <eryksun@gmail.com> - 2016-04-29 10:09 -0500
            Re: Why does pathlib not have is_readable() & things like that? Grant Edwards <grant.b.edwards@gmail.com> - 2016-04-29 23:53 +0000
  Re: Why does pathlib not have is_readable() & things like that? Steven D'Aprano <steve@pearwood.info> - 2016-04-27 01:46 +1000
    Re: Why does pathlib not have is_readable() & things like that? Adam Funk <a24061@ducksburg.com> - 2016-04-28 13:57 +0100

csiph-web