how to remove duplicate list in a list code example

Example 1: remove duplicates from a list of lists python

k = [[1, 2], [4], [5, 6, 2], [1, 2], [3], [4]]
new_k = []
for elem in k:
    if elem not in new_k:
        new_k.append(elem)
k = new_k
print k
# prints [[1, 2], [4], [5, 6, 2], [3]]

Example 2: python remove duplicate numbers

duplicate = [2, 4, 10, 20, 5, 2, 20, 4] 
print(list(set(duplicate))