Question

Implement function reverse that takes a 2D list (a list of list of integers) and returns a new 2D list where the items in each row are in reverse order. You maynot use slicing. You may not modify the input list. The returned list should be completely new in memory – no aliases with the input 2D list. From list methods, you may use only the .append().

Examples:

reverse([[1,2,3],[4,5,6]])       ->    [[3,2,1],[6,5,4]]

reverse([[1,2],[3,4],[5,6]])     ->    [[2,1],[4,3][6,5]]

True

False

In python please

Answer 1

def reverse(list):

    # declaring empty newList
    newList = []

    # iterating through every list
    for sublist in list:

        # declaring temp list
        temp = []

        # iterating through every sublist using range
        # starting from last element and decrementing length
        for index in range(len(sublist)-1, -1, -1):
            # appending temp list
            temp.append(sublist[index])

        # appending temp list to newList
        newList.append(temp)

    # returns new List
    return newList

print( reverse([[1,2,3],[4,5,6]]) )
print( reverse([[1,2],[3,4],[5,6]]) )

Code

Output