Question

I am a newbie to python and just learning things as i do my project and here i have two list of list which i need to compare and separate the diff found in A — > B and diff found b –> A
What is the best way of comparing.

A=[[1L, 'test_case_1'], [1L, 'test_case_2'], [2L, 'test_case_1']]
B=[[1L, 'test_case_1'], [1L, 'test_case_4'], [2L, 'test_case_1'], [2L, 'test_case_3']]

Answer 1

Assuming you can use a list of tuples as per my comment, this simple modification of Junuxx’s answer is much more efficient

A – B:

>>> setb = set(B)
>>> [x for x in A if not x in setb]
[(1L, 'test_case_2')]

B – A:

>>> seta = set(A)
>>> [x for x in B if not x in seta]
[(1L, 'test_case_4'), (2L, 'test_case_3')]