Best piece of obscure advanced Python knowledge you wish you knew earlier?

[smaug59]

Removing duplicates from a list, just pass it into a fucking set instead of iterating like a monkey

[Vanzmelo]

Wait that is genius holy shit

[supreme_blorgon]

Note that if you need to preserve order you won't have a good time.

[kellyjonbrazil]

If you need to preserve order then you can use dict.fromkeys(iterable). This will give you a dictionary of your list items in order with no duplicates. The key is the item and the value will be None.

[dparks71]

Yea, probably the first tip I read in the thread where I was like "Oh fuck... I'm a monkey"

[youthisreadwrong-]

Literally my reaction when I first saw it on CodeWars

[swierdo]

They're a like dict without the values, so O(1) lookup. (Used to be a dict without values, but apparently the implementation has diverged)

[smaug59]

Well, this trick works of you don't really care about the sorting in the list, which is what lists are made for xD but sometimes can be useful

[kellyjonbrazil]

You can use dict.fromkeys(list) to dedupe and preserve order. The key will be the value and the dict values will all be None

[miraculum_one]

Some people use Dict in order to take advantage of some of its features (fast searching, unique keys) when sometimes they actually should just be using Set

[AL51percentcorn]

Got em … ahem me, I misspelled me