Python hashable

If the value of an object never changes during its lifetime, and it is comparable to other objects, that object is hashable. (To check if it never changes, you need the __hash__() method and to check if it's comparable to other objects, you need the __eq__() method.) Two objects considered identical must always have the same hash value.

__hash__() make to be

key of
Python Dictionary

member of
python Set

Almost python immutable is hashable object

User-defined data types are essentially hashable. Basically, because the hash value of any object is obtained using the id() function, the hash values of all objects are different from each other.

Instead of dict

Don't let dicts spoil your code

I restricted the use of dicts in my code to make it easier to follow and maintain. Here's my explanation of the benefits and advice on what you can use instead. Bonus point: what to do with all the legacy code when there's no time to eradicate all the dicts.

https://roman.pt/posts/dont-let-dicts-spoil-your-code/

python의 dict

mapping objectdict는 다양한 방식으로 정의할 수 있다. xxxxxxxxxx>>> a = dict(one=1, two=2, three=3)>>> b = {'one': 1, 'two': 2, 'three': 3}>>> c = dict(zip(['one', 'two', 'three'], [1, 2, 3]))>>> d = dict([('one', 1), ('two', 2), ('three', 3)])>>> e = dict({'three': 3, 'two': 2, 'one': 1})>>> a == b == c == d == eTruedict은 mapping 객체 중 하나에 해당하며 mapping객체의 정의는 아래와 같다. 임의의 키 검색을 지원하고 Mapping 또는 MutableMapping추상클..

https://taiyoru.tistory.com/entry/python의-dict

Python hashable

Instead of dict

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