Why is it possible to replace sometimes set() with {}?

Question

In PyCharm, when I write:

return set([(sy + ady, sx + adx)])

it says \"Function call can be replaced with set literal\" so it repl

Answer 1

It is an alternative syntax for set()

>>> a = {1, 2}
>>> b = set()
>>> b.add(1)
>>> b.add(2)
>>> b
set([1, 2])
>>> a
set([1, 2])
>>> a == b
True
>>> type(a) == type(b)
True

dict syntax is different. It consists of key-value pairs. For example:

my_obj = {1:None, 2:None}