If context managers are considered advanced I despair at the code you're writing.
Advanced Python Features
11–20 of 183 posts
Re: Advanced Python Features
#12Nice!
I would add assert_never to the pattern matching section for exhaustiveness checks: https://typing.python.org/en/latest/guides/unreachable.html#...
Re: Advanced Python Features
#13This is a nice list of "things you might not know" that is worth skimming to add to your toolkit.
If you are really interested in "advanced Python", though, I would recommend the book Fluent Python by Ramalho. I have the first edition which is still highly relevant, including the async bits (you just have to translate the coroutines into async syntax). There is a second edition which is more up to date.
I would also recommend checking out the functools[0] and itertools[1] modules in the standard library. Just go and read the docs on them top to bottom.
It's also worth reading the first few sections of Python Data Model[2] and then bookmarking this page.
[0] https://docs.python.org/3/library/functools.html
Re: Advanced Python Features
#14TFA's use-case for for/else does not convince me: for server in servers: if server.check_availability(): primary_server = server break else: primary_server = backup_server deploy_application(primary_server) As it is shorter to do this: primary_server = backup_server for server in servers: if server.check_availability(): primary_server = server break deploy_application(primary_server)
I do like the else clause with for loops. However most people are not familiar with it, and also `else:` as a keyword is confusing. I always remember it as `no break:`.
I think of it as "otherwise:"
Re: Advanced Python Features
#15Good list. Some of these i knew already, but the typing overloading and keyword/positional-only arguments were new to me.
One personal favorite of mine is __all__ for use in __init__.py files. It specifies which items are imported whenever uses from x import *. Especially useful when you have other people working on your codebase with the tendency to always import everything, which is rarely a good idea.
Re: Advanced Python Features
#16This sounds fun if you have 10x programmers or at least IQ > 140 programmers in charge. Last place I worked, I was told never use "smart" tricks if you can do the same thing in a simpler way. For-else and f-strings and := sound like harmless enough (though the last one is controversial); "with" is useful for resources that need to be deallocated but "yield"? Really? "more readable" when you slap a decorator on the thing? Why are we packing the enter and exit operations into a single function?
Playing with the typesystem and generics like this makes me worry I'm about to have a panic attack.
Give me code that I can understand and debug easily, even when I didn't write it; don't do implicit magical control flow changes unless you have a very good excuse, and then document both the how and the why - and you'll get a product that launches earlier and has fewer bugs.
Sometimes, a few more if statements here and there make code that is easier to understand, even if there's a clever hack that could cut a line or two here and there.
Re: Advanced Python Features
#17Working in the ML field, I can't hate Python. But the type system (pre-3.12, of course) cost me a lot of nerves. Hoping for a better post-3.12 experience once all libraries are usable in 3.12+. After that experience, I’ve come to truly appreciate TypeScript’s type system. Never thought I’d say that.
Re: Advanced Python Features
#18Working in the ML field, I can't hate Python. But the type system (pre-3.12, of course) cost me a lot of nerves. Hoping for a better post-3.12 experience once all libraries are usable in 3.12+. After that experience, I’ve come to truly appreciate TypeScript’s type system. Never thought I’d say that.
Same experience here, Python’s typing experience is awful compared to TypeScript, even post-3.12. Mypy’s type inference is so dumb you have to write arguments like `i: int = 0`; `TypedDict`s seems promisable at first and then end up as a nightmare where you have to `cast` everything. I miss TypeScript’s `unknown` as well.
Re: Advanced Python Features
#19If context managers are considered advanced I despair at the code you're writing.
As a UD, I didn't know what a context manager was before reading this article, so you are not really far from the truth, tbh.
Re: Advanced Python Features
#20TFA's use-case for for/else does not convince me: for server in servers: if server.check_availability(): primary_server = server break else: primary_server = backup_server deploy_application(primary_server) As it is shorter to do this: primary_server = backup_server for server in servers: if server.check_availability(): primary_server = server break deploy_application(primary_server)
What about this?
for server in servers:
if server.check_availability():
primary_server = server
break
else:
logger.warning("Cannot find a valid server") #