sample = ['AAAA','ABCB','CCCC','DDEF']
I need to eliminate all elements where every character is identical to itself in the element eg. AAAAA,CCCCC
output = ['ABCB','DDEF'] sample1 = for i in sample: for j in i: if j == j+1: #This needs to be corrected to if all elements in i identical to each other i.e. if all "j's" are the same sample1.pop(i)
sample = ['AAAA','ABCB','CCCC','DDEF'] output = [sublist for sublist in sample if len(set(sublist)) > 1]
EDIT to answer comment.
sample = [['CGG', 'ATT'], ['ATT', 'CCC']] output =  for sublist in sample: if all([len(set(each)) > 1 for each in sublist]): output.append(sublist) # List comprehension (doing the same job as the code above) output2 = [sublist for sublist in sample if all((len(set(each)) > 1 for each in sublist))]