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Problems I Have with Python

darkf.github.io

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21–30 of 239 posts

Re: Problems I Have with Python

#21

Post by darkf »

lmm wrote: post #19

Python's semantics are unlikely to ever be fast and most Python users have already worked around its speed issues. asyncio is new; python3 porting is happening. It seems unfair to complain that no real improvements are being made and also complain that these new things are immature. reduce being pushed behind an import is stupid, but it's only one import. lambda is fine, if you're writing in functional style you're u…

>lambda is fine, if you're writing in functional style you're using expressions for everything anyway.

No, I /really would/ like to be able to write:

foo.on_click(lambda: x += 1)

The language not supporting this (when most others do) is just silly.

Re: Problems I Have with Python

#22

Post by jks »

lmm wrote: post #19

Python's semantics are unlikely to ever be fast and most Python users have already worked around its speed issues. asyncio is new; python3 porting is happening. It seems unfair to complain that no real improvements are being made and also complain that these new things are immature. reduce being pushed behind an import is stupid, but it's only one import. lambda is fine, if you're writing in functional style you're u…

Here's a thoughtful critique of asyncio, posted some time ago on Hacker News: http://lucumr.pocoo.org/2016/10/30/i-dont-understand-asyncio...

Yes, attrs seems like a good solution for plain-old-data classes. https://attrs.readthedocs.io/en/stable/

Re: Problems I Have with Python

#23

Post by shawabawa3 »

nicwest wrote: post #16

could someone explain to me why >>> ranges = [range(i) for i in range(5)] >>> [*item for item in ranges] [0, 0, 1, 0, 1, 2, 0, 1, 2, 3] would be better than: >>> ranges = [range(i) for i in range(5)] >>> [item for subrange in ranges for item in subrange] [0, 0, 1, 0, 1, 2, 0, 1, 2, 3]

Less verbose.

Also, what happens if you have even more nested lists you want to flatten?

Personally I think it should just be

    flatten(range(i) or i in range(5))
With flatten in the global namespace

Re: Problems I Have with Python

#24

Post by Grue3 »

y7 wrote: post #9

Very short-sightedly written. It sounds like the author just wants a language with a different philosophy, and instead of realizing this goes on to call the differences "obvious flaws in design" that aren't improved because of "Incompetence? Politics? Who knows." This is especially bad given that Python (in my opinion) has a very well thought-out and transparent change process, with PEPs that usually consider most al…

>Why is it such a problem to move your closure to its own line and give it a name?

What if it cannot have a meaningful name? You don't give a name to every single value in your program, why would first-class functions be any different? Like, there's an idiom in python where you write a function named "wrapper" in a decorator and then return wrapper. Except you put @wraps on it, so the name of this function isn't even "wrapper" anymore. So what was the point of naming it "wrapper" when you could just do ```return wraps(lambda ...)``` if lambda wasn't so underpowered.

Re: Problems I Have with Python

#25

Post by fleetfox »

Grue3 wrote: post #18

I like this list a lot. I also find myself raging at awful lambda and the lack of switch. No, it wouldn't make the language any less "pythonic" to make them useful.

IMHO switch is horrible construct i'd rather see ML style pattern matching

Re: Problems I Have with Python

#27

Post by willvarfar »

I find myself nodding to everything on the list.

I use python all the time. The lack of first-class anonymous functions is plain irritating.

I would add to the list that nonlocal is horridly limited, that I want to be able to better do do-while loops and want to better exit from nested loops more cleanly and such.

Re: Problems I Have with Python

#28

Post by Loic »

orf wrote: post #15
Loic wrote: post #3

The one problem I have with Python and would like to solve, is to be able, from within a request rendering function/method of my web application (think Flask) to run something like: handle1 = call_webservice_1(args) handle2 = call_webservice_2(args) handle3 = call_webservice_3(args) (realres1, realres2, realres3) = wait_until_timeout(500, handle1, handle2, handle3) # here, I have my results in realresX or None if tim…

from asyncio import wait, gather, get_event_loop from aiohttp import web async my_handler(request): handle1 = call_webservice_1(args) handle2 = call_webservice_2(args) handle3 = call_webservice_3(args) await wait(gather(handle1, handle2, handle3), 500) return web.Response({'finished': True}) app = web.Application() app.router.add_route('GET', '/test/', my_handler) loop = asyncio.get_event_loop() server = loop.create_…

I am using flask because you know, long string of development with flask over the years, your application is growing and then you hit some walls. I do not want to rewrite everything just for a couple of views within my application.

Flask with gunicorn has its own even loop and asyncio io another one and at the end it is hard to be sure if something is working because I am lucky or because it is the way to do things.

Anyway, thank you for your example, it is really clear and easy to understand! Maybe we need a flask like framework which is asyncio based. Which mean I will need to upgrade the code to Python 3 :)

Re: Problems I Have with Python

#29

Post by mundanevoice »

darkf wrote: post #21
lmm wrote: post #19

Python's semantics are unlikely to ever be fast and most Python users have already worked around its speed issues. asyncio is new; python3 porting is happening. It seems unfair to complain that no real improvements are being made and also complain that these new things are immature. reduce being pushed behind an import is stupid, but it's only one import. lambda is fine, if you're writing in functional style you're u…

>lambda is fine, if you're writing in functional style you're using expressions for everything anyway. No, I /really would/ like to be able to write: foo.on_click(lambda: x += 1) The language not supporting this (when most others do) is just silly.

Try using some other language that is functional like LISP or Haskell maybe. Python goals is not be a functional language that that's okay.

Re: Problems I Have with Python

#30

Post by orf »

Loic wrote: post #28
orf wrote: post #15

Earlier quoted context omitted.

from asyncio import wait, gather, get_event_loop from aiohttp import web async my_handler(request): handle1 = call_webservice_1(args) handle2 = call_webservice_2(args) handle3 = call_webservice_3(args) await wait(gather(handle1, handle2, handle3), 500) return web.Response({'finished': True}) app = web.Application() app.router.add_route('GET', '/test/', my_handler) loop = asyncio.get_event_loop() server = loop.create_…

I am using flask because you know, long string of development with flask over the years, your application is growing and then you hit some walls. I do not want to rewrite everything just for a couple of views within my application. Flask with gunicorn has its own even loop and asyncio io another one and at the end it is hard to be sure if something is working because I am lucky or because it is the way to do things.…

http://flask-aiohttp.readthedocs.io/en/latest/ ;)
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