概述：

可以從一個int數(shù)字或1維array里隨機(jī)選取內(nèi)容，并將選取結(jié)果放入n維array中返回。

說明：

numpy.random.choice(a, size=None, replace=True, p=None)

a : 1-D array-like or int
If an ndarray, a random sample is generated from its elements.
If an int, the random sample is generated as if a was np.arange(n)

size : int or tuple of ints, optional

replace : boolean, optional
Whether the sample is with or without replacement

p : 1-D array-like, optional
The probabilities associated with each entry in a. If not given the sample assumes a uniform distribution over all entries in a.

示例

>>> np.random.choice(5, 3) array([0, 3, 4])>>> np.random.choice(5, 3, p=[0.1, 0, 0.3, 0.6, 0]) array([3, 3, 0])>>> np.random.choice(5, 3, replace=False) array([3,1,0])>>> np.random.choice(5, 3, replace=False, p=[0.1, 0, 0.3, 0.6, 0]) array([2, 3, 0])>>> aa_milne_arr = ['pooh', 'rabbit', 'piglet', 'Christopher']>>> np.random.choice(aa_milne_arr, 5, p=[0.5, 0.1, 0.1, 0.3]) array(['pooh', 'pooh', 'pooh', 'Christopher', 'piglet'],

官方介紹

http://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.random.choice.html

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