NumPy参考 >例行程序 >Random sampling (numpy.random) >Legacy Generator (RandomState) > numpy.random.RandomState.shuffle
method
RandomState.
shuffle
(x)¶Modify a sequence in-place by shuffling its contents.
This function only shuffles the array along the first axis of a multi-dimensional array. The order of sub-arrays is changed but their contents remains the same.
Note
New code should use the shuffle
method of a default_rng()
instance instead; see random-quick-start.
The array or list to be shuffled.
See also
Generator.shuffle
which should be used for new code.
Examples
>>> arr = np.arange(10)
>>> np.random.shuffle(arr)
>>> arr
[1 7 5 2 9 4 3 6 0 8] # random
Multi-dimensional arrays are only shuffled along the first axis:
>>> arr = np.arange(9).reshape((3, 3))
>>> np.random.shuffle(arr)
>>> arr
array([[3, 4, 5], # random
[6, 7, 8],
[0, 1, 2]])