#nested structure?
def Lister (list):
    for x in list:
        print("x=", x )

myList = [-2, 4, 42]
Lister(myList)

MYsTRINGS = ['This', 'Is', "Cool"]
Lister(MYsTRINGS)

myNestList = [-2, [3,4], 42]
Lister (myNestList)