Randomly sampling from multiple lists

I have some data currently stored in 3 lists, let's call them a, b and c. The lists all contain n elements. I would like to take a random sample of my data, say of size sample_n, to create some smaller dataset to play around with but I want to take the same random sample from each list. That is, I want to randomly select the same elements from each list. So if I randomly select element i, I would like to take element i from each list (a[i], b[i] and c[i]). I do not want to generate 3 sets of random numbers so that the three lists' elements do not match. E.g.running this random sampling for each set separately is not what I want.

I would think all I need to do is generate a separate list of random numbers, random_list, that is of length sample_n and then do something like

for element in range(len(random_list)):
      sample_a[element] = a[random_list[element]]
      sample_b[element] = b[random_list[element]]
      sample_c[element] = c[random_list[element]]

However, I don't know how to generate a random number list! And also I was wondering if there was a more efficient method than what i was thinking of here.