Add os.walk wrapper

[stankudrow]

Addresses the issue #160 .

Features:

• Now the wrap function is placed in the base.py module as a basic function of sorts -> importing the wrap function from the os.py or ospath.py are not expected to be down
• the wrapped functions got arranged alphabetically and form sections split by new lines
• added a test on the wrapped os.walk coroutine

[stankudrow]

Blocked by the PR #192 .

Update: not any more.

[stankudrow]

#160 (comment) - the os.listdir already wrapped, the os.walk added.

[stankudrow]

@Tinche , hello. Rebased and ready for review, all checks have been passed.

Update: I found the issue #167 on an "invented-here" solution, what are your suggestions?

[stankudrow]

@Tinche , hello, shall we review this PR, please?

[Tinche]

Apologies. I have a small baby nowadays.

So the original sync os.walk is a generator, right? This has some very useful properties which we should keep. Can we make the async version an async generator? Each step can do a step of the sync one.

[stankudrow]

Apologies. I have a small baby nowadays.

So the original sync os.walk is a generator, right? This has some very useful properties which we should keep. Can we make the async version an async generator? Each step can do a step of the sync one.

Hello and no need for apologies, au contraire, congratulations.

[stankudrow]

@iiSeymour , @alemigo , hello. Could you possibly help with reviewing?

[stankudrow]

@Tinche , hello. If you have time, could you assign a reviewer for this PR? Thank you and I wish you splendid holidays.

[Tinche]

Ok, better, but this function isn't really async now. It doesn't handle file system operations in a thread, and so can block the event loop, which we're trying to avoid.

Instead of a simple for loop, try executing next() on the threadpool.

To get you started, maybe try something like

source = os.walk(...)

while True:
    f = await loop.run_in_executor(None, next, source)