numpy.random.shuffle returns None

Question

I installed numpy1.8.2 and then I tried the following code:

import numpy as np
a = np.arange(10)
print a, np.random.shuffle(a)

but

Answer 1

If you want to 'shuffle' out of place then use np.random.permutation.

e.g.

In [1]: import numpy as np

In [2]: np.random.permutation([1,2,3,4,5])
Out[2]: array([3, 5, 1, 4, 2])