[Solved] unkown (to me) function def parm "name1:name2" syntax.

[MvGulik]

I came across a function definition (inside a class) which has a "name1: name2" part.

def func(self, name1: name2):

Has that "name1: name2" syntax a name? (general searching is a bit tricky on this one)
And I guess: Any particular reasons/benefits for using it.

In case it might matter (probably not). Its used in some python script that is used within an otherwise Java environment.