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

set([iterable]) is the constructor to create a set from the optional iterable iterable. And {} is to create set / dict object literals. So what is created depends on how you use it.

In [414]: x = {}

In [415]: type(x)
Out[415]: dict

In [416]: x = {1}

In [417]: type(x)
Out[417]: set

In [418]: x = {1: "hello"}

In [419]: type(x)
Out[419]: dict