PRO TIP For Using Dictionaries In Python (ft. get & setdefault)

[@lawrencedoliveiro9104]

I keep forgetting about setdefault. Must remember to use that more. And here’s another tip: deleting a dictionary entry that might not exist. Where del d[key] will raise KeyError if there is no such entry, d.pop(key, None) will not.

[@alidev425]

Your videos are always so interesting and engaging. Keep up the good work!

[@krzysiekkrzysiek9059]

More examples like this one please. Short and valuable tips.

[@hlubradio2318]

Always great thanks

[@versacebroccoli7238]

Yo that .get() method is sick. Before I was using; try: dict[key] except KeyError: pass

[@ApplepieFTW]

A comparison of setdefault vs defaultdict could be really interesting too

[@NoProblem76]

sigh, it should've been DefaultDict

[@piotrrybka318]

One important information is that if used with an existing key, `setdefault` will not change its value, so: res = d.setdefault('xyz', 0) # creates 'xyz': 0 print(res) # 0 res = d.setdefault('xyz', 1) # takes already existing 'xyz' print(res) # 0 # not 1

[@Hoxle-87]

Great for tree searches

[@nadavstretiner]

You could also use defaultdict, one of my favourite collections.

[@xBobz99]

So calling setdefault is like dict[key] = dict.get(key, default)

[@miguelvasquez9849]

there is a way to perform an action with the old value and the new with "setdefault" if the key already exists?

[@loverboykimi]

that's gold!

[@johanngerell]

:D and here I've been doing my own "get or create" dict helper function for eons

[@Indently]

Tell me about it ahah, these changed my life when I learned about them.

[@HL_SAIRA]

Great

[@U53RN07F0UND]

Not a method of a built-in, but I find myself using StringIO from the io library an awful lot lately.

[@mcdolla7965]

i think for this kind of problem , defaultdict() is better sir

[@Indently]

They're 2 completely different functions that do 2 completely different things.

[@mcdolla7965]

yeah...i agree sir, felt like similar thas y commented

[@lawrencedoliveiro9104]

This is why it helps to keep the Python library docs in your bookmark list!

[@dragweb7725]

interesting

[@Sinke_100]

👍🏻

[@chx75]

get is nice, but setdefault is messy

[@kvelez]

people = {"Mario":1, "Luigi":2} print(people["Mario"]) print(people.get("Wario", -1)) # val/None if not a key print(people.setdefault("Waluigui", 3)) try: print(people['Peach']) except KeyError: print("Not a valid key.") print(people)