Re: PEP668 / pipx and "--editable" installs
I never used virtual environments and wouldn't like to start with it. There's your problem - everything else is a result of this. There is just no nice way to work with a combination of pypi, apt-get and system-wide python. Everyone uses virtual environments. Sorry. -- https://mail.python.org/mailman/listinfo/python-list
Re: PEP668 / pipx and "--editable" installs
It is nothing bad about using virtual environments but also not about not using them. In my own work I haven't see a use case where I needed them. And I expect that some day I'll encounter a use case for it. This here is not about pro and cons of virtual environments. You are in a use case where you need them, right now :) When you understand the benefits of virtual environments you will understand what I meant by that. Please explain how the two problems I explained are influenced by not using virtual environments. The first problem can be avoided because virtual environments can use a different version of python than the system one. If you need an earlier version of python then you can use it instead. The second problem can be avoided because virtual environments exist in a part of the file system that you have write access to, so you don't need to use sudo to install packages. Your main user account does not have write access to /usr/bin. Also when a virtual environment is activated the path to it's packages is a part of that environment so your code will always be able to import the packages you want. It's much easier to understand if you try it for yourself. Google has many excellent resources, here is one https://www.freecodecamp.org/news/how-to-setup-virtual-environments-in-python/ Best of luck :) R -- https://mail.python.org/mailman/listinfo/python-list
Async options for flask app
Hi all, I'm writing a fediverse server app, similar to kbin https://kbin.pub/en and lemmy https://join-lemmy.org/. It's like reddit except anyone can run a server in the same way email works. This architecture involves a lot of inter-server communication, potentially involving thousands of different servers. So, lots of network I/O. Lots of tasks running in parallel to do I/O with different servers simultaneously. A fair bit of DB access too. The current fashion is to do this with cooperative multitasking (async/await/gevent/etc) to avoid the overhead associated with continually context switching threads and processes. Correct me if I'm wrong. How can I do this with Flask? Any async/await tricks? Can I just configure gunicorn to use gevent worker threads? https://flask.palletsprojects.com/en/2.3.x/deploying/gunicorn/ Has anyone tried Quart? https://pypi.org/project/quart/ How well does gevent monkey-patch into a Flask app? A penny for your thoughts Thanks! R -- https://mail.python.org/mailman/listinfo/python-list
Re: Code improvement question
Why don't you use re.findall?
re.findall(r'\b[0-9]{2,7}-[0-9]{2}-[0-9]{2}\b', txt)
I think I can see what you did there but it won't make sense to me - or
whoever looks at the code - in future.
That answers your specific question. However, I am in awe of people who
can just "do" regular expressions and I thank you very much for what
would have been a monumental effort had I tried it.
I feel the same way about regex. If I can find a way to write something
without regex I very much prefer to as regex usually adds complexity and
hurts readability.
You might find https://regex101.com/ to be useful for testing your
regex. You can enter in sample data and see if it matches.
If I understood what your regex was trying to do I might be able to
suggest some python to do the same thing. Is it just removing numbers
from text?
The for loop, "for bit in bits" etc, could be written as a list
comprehension.
pieces = [bit if len(bit) > 6 else "" for bit in bits]
For devs familiar with other languages but new to Python this will look
like gibberish so arguably the original for loop is clearer, depending
on your team.
It's worth making the effort to get into list comprehensions though
because they're awesome.
That little re.sub() came from ChatGPT and I can understand it without
too much effort because it came documented
I suppose ChatGPT is the answer to this thread. Or everything. Or will be.
I am doubtful. We'll see!
R
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Re: Code improvement question
re.findall(r'\b[0-9]{2,7}-[0-9]{2}-[0-9]{2}\b', txt)
\b - a word boundary.
[0-9]{2,7} - 2 to 7 digits
- - a hyphen-minus
[0-9]{2} - exactly 2 digits
- - a hyphen-minus
[0-9]{2} - exactly 2 digits
\b - a word boundary.
Seems quite straightforward to me. I'll be impressed if you can write
that in Python in a way which is easier to read.
Now that I know what {} does, you're right, that IS straightforward!
Maybe 2023 will be the year I finally get off my arse and learn regex.
Thanks :)
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Re: Silly/crazy problem with sqlite
I really can't think of a case
where the missing comma would make any sense at all.
That is pretty tricky, yes.
The comma means it's a tuple. Without the comma, it's just a string with
parenthesis around it, which is a string.
PyDev console: starting.
Python 3.9.15 (main, Oct 28 2022, 17:28:38) [GCC] on linux
x = ('%' + "2023-11" + '%')
x
'%2023-11%'
x = ('%' + x + '%',)
x
('%%2023-11%%',)
x.__class__.__name__
'tuple'
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