Selecting MAX from a list

[Ines T]

I need to select a maximum number from a list and then call the variable that
identifies that number, for example:
x1,x2=1, y1,y2=4, z1,z2=3
So I need first to find 4 and then to take y to do additional operations as y-z.
I will appreciate your SOON help!

 

[lbolla]

I need to select a maximum number from a list and then call the variable that
identifies that number, for example:
x1,x2=1, y1,y2=4, z1,z2=3
So I need first to find 4 and then to take y to do additional operations as y-z.

It's not clear what you are supposed to do, but wouldn't a combination
of "max" and "index" do?
x = [3,2,1,4,5,2,3]
max(x) # 5
x.index(5) # 4

I will appreciate your SOON help!

And, by the way, politeness is free!