Show HN: Python micro event loop library (~250 LOC)

https://gist.github.com/tarruda/5b8c19779c8ff4e8100f0b37eb5981ea

by tarruda • 1 year ago

59 12 1 year ago

gist.github.com

vram22• 1 year ago

It's 736 LOC now.

Last 2 lines, 735 and 736:

    # Start the event loop with the main coroutine
    event_loop(main())

Gys• 1 year ago

That is counting all comments and empty lines, which are many.

tarruda2• 1 year ago

If you count only the library code, it is less than 250 LOC.

I then asked for Claude to write the docstrings and examples which increased by 500

d0mine2• 1 year ago

It reminded me of pycon talk by David Beazley - Python Concurrency From the Ground Up: LIVE! - PyCon 2015 https://www.youtube.com/watch?v=MCs5OvhV9S4

What is the purpose of @dataclass on Task class?

dnadler• 1 year ago

I haven’t kept up with python too much over the past year or two and learned a couple new things from this code. Namely, match/case and generic class typing. Makes me wonder what else is new, off to the python docs!

svilen_dobrev2• 1 year ago

thanks for pointing that out. Seems a thorough scan as features of whatsnew is due - since maybe 3.7?

For the record, ~language~ additions i found interesting (excluding type-hints):

  3.11:
   (Base)ExceptionGroups ; (Base)Exception.add_note() + __notes__
   modules: tomllib
  3.10:
   Parenthesized context managers 
   Structural Pattern Matching - match..:case.. 
   builtins: aiter(), anext() 
  3.9:
   dict | dict ; dict |= dict
   for a in *x,*y: ...    #no need of (*x,*y)
   str.removeprefix , str.removesuffix
   Any valid expression can now be used as a decorator
   modules: zoneinfo , graphlib
  3.8:
   Assignment expressions
   Positional-only parameters
   f'{expr=}'
   Dict comprehensions and literals compute First the key and Second value
  3.7:
   builtins: breakpoint()
   __getattr__ and __dir__ of modules
   modules: contextvars , dataclasses

hyperbrainer2• 1 year ago

There was also the walrus operator

d0mine2• 1 year ago

Misc:

3.10 zip(strict=True) 3.11 asyncio.TaskGroup (structured concurrency) enabled by ExceptionGroup

3.12 itertools.batched(L, n) — it replaces zip([iter(L)]n)

somesun• 1 year ago

very good example to learn async , will try it

Show HN: Python micro event loop library (~250 LOC)

Related Stories