Dictionaries

Question

a={1, 2}
What does it mean? If i try to do "print(a[1])", there's error. I thought, that this script means "0" as value and 1,2 as keys(a={1:0,2:0}), but if it was true, there wouldn't be any error. Help

Answer 1

Because "a" is a set and set object does not support indexing
dictionary synax is like this:
{key: value, ...}

Answer 2

https://www.programiz.com/JUMP_LINK__&&__python__&&__JUMP_LINK-programming/set
https://www.w3schools.com/python/python_dictionaries.asp

Answer 3

Mert Yazıcı "set" is one of types of data or "a" is dictionary or what? Sorry, can you explain it again, please

Answer 4

Mert Yazıcı thaks!