I Didn't Know Dictionaries Could Do THIS In Python

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I didn't know dictionaries could do this in Python. #code #python #programming

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I find this to be really more dangerous than useful ^^

julienb.

dict expects an iterable of two-element tuples. But it is duck-typed, so as long as your iterable yields a series of objects of length 2, it works on them! For each x in the iterable, dict takes x[0] as the key and x[1] as the value.

scottclowe

I wasn't aware of this either, but it does make sense. Strings can be seen as a sequence of characters, similar to a list, and the dict function can convert a list of two elements into a dictionary. Therefore, if you have a list of strings where each string consists of two characters, it can be considered a list of two-element sequences suitable for conversion into a dictionary.

nogamenolife

This is because it expectes an iter of iters, with the inner iter having a len of 2, this a tuple if strings, each being pairs of chars, will work

AlyceIsFree

I didn't know it too but that's kinda hard to use, very cool though

AkivaB

And for this to work the string length of the values element must exactly be equal to 2 for each. This means it won't work with a value like "Jan1" or "D12" but only "J1" and "D1" likes.

mubarakdederi

This make sense because String is just a list of Chars(Characters)

theplant

I am perfectly cool with not knowing this or using it ever 😂

Deerbruh

do not to this .. be explicit with your tuples and their k, v alignment

DeviantFox

It's almost like a string is just an array of characters.

bluesquare

Cool, but unnecessarily obfuscated to anyone reading through code and not knowing this technique

decky

python is full of surprises and as a high level language either though I know lots of other languages, but I wish to spend my time on python, Dictionaries in python are incredibly efficient O(1) in most operations . and they got even better after 3.8, they have now ordered dictionaries by themselves.

xzex

This works with any iterable of [iterable of lenght 2], so a more useful example would be :
entries = [("A", 13), ("B", 42), ("C", 69)]
print(dict(entries))
{'A': 13, 'B': 42, 'C': 69}

loic.bertrand