numpy.random.Generator.shuffle

method

random.Generator. shuffle ( x, axis=0 )

Modify an array or sequence in-place by shuffling its contents.

The order of sub-arrays is changed but their contents remains the same.

Parameters

x ndarray or MutableSequence

The array, list or mutable sequence to be shuffled.

axis int, optional

The axis which x is shuffled along. Default is 0. It is only supported on ndarray objects.

Returns

None

Examples

>>> rng = np.random.default_rng()
>>> arr = np.arange(10)
>>> rng.shuffle(arr)
>>> arr
[1 7 5 2 9 4 3 6 0 8] # random

>>> arr = np.arange(9).reshape((3, 3))
>>> rng.shuffle(arr)
>>> arr
array([[3, 4, 5], # random
       [6, 7, 8],
       [0, 1, 2]])

>>> arr = np.arange(9).reshape((3, 3))
>>> rng.shuffle(arr, axis=1)
>>> arr
array([[2, 0, 1], # random
       [5, 3, 4],
       [8, 6, 7]])