Removing duplicates from list of lists in Python

Question

Can anyone suggest a good solution to remove duplicates from nested lists if wanting to evaluate duplicates based on first element of each nested list?

The main list

Answer 1

i am not sure what you meant by "another list", so i assume you are saying those lists inside L

a=[]
L = [['14', '65', 76], ['2', '5', 6], ['7', '12', 33], ['14', '22', 46],['7','a','b']]
for item in L:
    if not item[0] in a:
        a.append(item[0])
        print item