On Fri, Jul 9, 2021 at 6:21 PM Steven D'Aprano <[email protected]> wrote:
> Has anything changed since the last time it was discussed? If nothing
> has changed, and there are no new arguments in favour of the change, why
> do you think the result will be any different?
>
Note: one thing that has not been rejected, and would likely be accepted,
is adding the capability in the json module to pass in a filename, rather
than an open file, to have a json file read. So your example would be:
(untested)
`asyncio.to_thread(pathlib.Path(...).read_text, encoding="utf8")`
import json
the_path - pathlib.Path(....)
asyncio.to_thread(json.loadf, the_path)
which reads even better to me.
And while I like json file reading to be more simple, I don't understand
why any of this is needed to "interact with the event loop as few times as
possible and use only the RAM absolutely required."
Honestly I'm still not totally clear on all things async, but what's wrong
with:
with open(the_path, encoding="utf-8") as the_file:
asyncio.to_thread(json.load, the_file)
It opens the file in the main thread, and not asynchronously, but doesn't
the file itself get read in the other thead, asynchronously? And is there
any extra RAM used?
Also -- and this may be completely my ignorance -- but don't you need to
wrap the json reading in a function anyway so that you can capture the
result somewhere?
In short -- no, I don't think JSON is not special enough to get a Path
method, but a simple way to read JSON directly from a Path would be nice.
-CHB
> Why not just subclass pathlib.Path and add the method yourself?
>
> class MyPath(pathlib.Path):
> def json(self):
> ...
>
> Or for that matter, you can add an extension method to pathlib.Path:
>
> def json(self):
> ...
>
> pathlib.Path.json = json
>
>
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--
Christopher Barker, PhD (Chris)
Python Language Consulting
- Teaching
- Scientific Software Development
- Desktop GUI and Web Development
- wxPython, numpy, scipy, Cython
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