Go中的三个逗号语法是什么？

Question

Can anyone explain to me what is this line doing? I've never seen this before, I guess.

np.Point, np.Valid = Point{}, false

As stated in this github code

Answer 1

This is not a three comma syntax. It is actually initializing two variables together in a line

np.Point, np.Valid = Point{}, false

is similar to

np.Point = Point{}
np.Valid = false