List of lists

[MarkLogan]

def open_file(fish):

    fp = open(txtt.txt, 'r')
    fp = [line.rstrip('\n') for line in fp]
    return fp


open_file(fish)
fp = open file(fish)


def read_file(fp):
    r = []
    l = []
    n = 10
    for i in range(n):
        r.append(l)

I know how to add the number in the lists l but not how to split them.