I mean this would remove False and None from a list though.
Also 0 and empty strings
And empty lists, tuples, dictionaries, sets, and strings
results = list(filter(None, results))
results = [result for result in results if result != None]
Should be is not None (:
You're right, though IIRC there's no functional difference when comparing to None (other than speed).
Yes there is. One invokes __ne__ on the left hand side, the other performs an identity comparison.
Meanwhile in Java land:
Map map = new Map()
Map is an interface though, you'd have to use HashMap 😅
I don’t visit often…
Should have used memory safe rust.
nailed it
People used to argue that Python was incredibly readable. Then I started seeing shit like this.
I'd say this is pretty readable
It jams far too much on one line. Break it up. It's a mistake I see a lot on Python.
but if you do it as a for loop it would be slower
Unless you're looping over more than a million elements, that's a poor excuse.
or you're doing this a million times
I think that Python has a bit of a 'Microsoft Word' thing on the go. You know how your own docs are completely editable and print fine, but everyone else's are a complete fucking disaster and pressing a single key will screw up the formatting of the whole document? Your own Python code is full of sensible idioms and pragmatic naming conventions, but everyone else's was plainly written while on mushrooms.
I don't know python, but it's clear what that line does
The image you've uploaded is a humorous take on a programming practice common among Python developers. It shows a list comprehension, which is a concise way to create lists in Python. The joke is that nobody prompted the Python programmers to use a complex or sophisticated feature, yet they are using it anyway, which implies that Python programmers tend to use list comprehensions frequently and perhaps even when they are not strictly necessary. List comprehensions are a popular feature in Python because they can make the code more readable and expressive, and this meme plays on the idea that Python programmers might be eager to use them at every opportunity.
Has someone finally just given ChatGPT a Lemmy account?
i think there actually is one i just copy pasted for the meeeem
Good lord, it’s gained sentience
Python has great list comprehension. Too bad it’s incomprehensible to humans.
But seriously whoever writes those cool oneliners is a shitty programmer. Life is not code golf, fuck off with your smart ass.
What would be the alternative? (assuming that you want to do the loop yourself)
new_results = []
for result in results:
if result:
new_results.append(result)
results = new_results
or else
for result in results:
if not result:
results.remove(result)
which doesn't do the exact same thing.
Honestly, this list comprehension is much faster to read and quite easy to understand.
I think we could rename the "result" variable "x" or "res" and it would be less confusing though.
[ L I S T C O M P R E H E N T I O N ]
I've written this more times than I can remember 😹 who needs filter anyway? Gotta use up all this ram.
It does! it takes a list (or other iterator) and filters out all values that are cast to boolean True. The same could be archived with
results = list(filter(bool, results))
It would filter out values that cast to False, no?
Like None, 0, "", ...
i wasn't sure how to phrase it, it keeps all values that cast to True, and discards all that cast to False
Python's disdain for the industry standard is wild. Every other language made in the last 20 years has proper filtering that doesn't require collecting the results back into a list after filtering like Java (granted it's even more verbose in Java but that's a low bar).
If Python had modern lambdas and filter was written in an inclusion or parametric polymorphic way, then you could write:
new_results = results.filter(x -> x)
Many languages have shorthands to refer to variables too, so it wouldn't be impossible to see:
new_results = results.filter(_)
Of course in actual Python you'd instead see:
new_results = list(filter(lambda x: x, results))
which is arguably worse than
new_results = [x for x in results if x]
True.
hey if you can think of a better way
Looks like something I'd write while high
Checks out
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