# -*- coding: utf-8 -*-
arr=[]
ar = 0
for i in range(4): arr.append([])
for j in range(4):
    for i in range(4):
        ar =ar+1
        arr[j].append(ar)
print("arr =", end=" ")
for j in range(4):
    for i in range(4):
        if 1 >= arr[j][i] or arr[j][i] <= 9:
            print(" ",arr[j][i], end=" ")
        else:
            print("", arr[j][i], end=" ")
        if i==3:
            print()
            print("     ",end=" ")
print()
print("arr =",arr)

arr=zip(*[iter(range(1,17))]*4)
arr=map(list, arr)
arr[1][1],arr[2][3]=arr[2][3],arr[1][1]
print "arr =", arr

      
arr = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 16]]

arr[3][-1]
#или так
arr[3][3]

arr2=[1,2,3]
print("arr2.index =",end=" ")
for i in range(1, 4):
    print(arr2.index(i), end=" ")
print()

arr = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 16], [13, 14, 15, 12]]

arr = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 16], [13, 14, 15, 12]]
for i,ls in enumerate(arr):
    for j,e in enumerate(ls): 
        print('{} -> <{} {}>'.format(e,i,j))

>>> arr = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 16], [13, 14, 15, 12]]
>>> print(*range(len(arr)))
0 1 2 3
>>> print(*range(len(arr[0])))
0 1 2 3
>>>

arr2=[1,2,3]
print('arr2=',arr2)
print('arr2[1] =',arr2[1])
print('arr2.index(2) =',arr2.index(2))

arr = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 16], [13, 14, 15, 12]]
print('arr =',arr)
print('arr[1][1] =', arr[1][1])

print(*range(len(arr))) 

def index(arr,required):
    for i,ls in enumerate(arr):
        for j,e in enumerate(ls):
            if e == required:
                return i,j
            
arr = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 16], [13, 14, 15, 12]]
print(index(arr,6))
(1, 1)