1. numpy.random.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.

Parameters:	
x : array_like. The array or list to be shuffled.

Returns: None

注意：

無返回值，改變原有 array
對于多維 array，只 shuffle 第一維

2. numpy.random.permutation(x)

Randomly permute a sequence, or return a permuted range.

If x is a multi-dimensional array, it is only shuffled along its first index.

Parameters:	
x : int or array_like

If x is an integer, randomly permute np.arange(x). If x is an array, make a copy and shuffle the elements randomly.

Returns:	
out : ndarray

Permuted sequence or array range.

注意：

跟 shuffle 的區別

有返回值
且不改變原來的 array，會生成一個新的 array

x 為整型時，先將 x 變成 array： np.arange(x)，再打亂順序

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