Insert in a list random of 0 and 1 with a certain number of 1's

Question

How do I generate a list of length N with random 0 and 1 values , but with a given number of 1\'s put randomly in the list.

For example, I want a list of 10

Answer 1

You can make the list have the right number of 0's and 1's pretty easily

data = [0] * 3 + [1] * 7

and then use random.shuffle to make their positions within the list random

from random import shuffle
shuffle(data)
print data

[1, 1, 0, 1, 1, 0, 0, 1, 1, 1]