• lambda x: -x[1], x[0])

Question related to mission The Most Wanted Letter

 

Where can I read documentation about -x[1] at: lambda x: -x[1], x[0])

What exactly does it means?

Created at: Sept. 3, 2019, 7:02 p.m.; Updated at: Sept. 12, 2019, 9:49 a.m.