random 하게 list data split

import random

with open("datafile.txt", "rb") as f:
    data = f.read().split('\n')

random.shuffle(data)

train_data = data[:50]
test_data = data[50:]

출처 : http://stackoverflow.com/questions/17412439/how-to-split-data-into-trainset-and-testset-randomly