random.randint(0,0) 可以得到0
但是:
>>> np.random.randint(0,0)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "mtrand.pyx", line 747, in numpy.random.mtrand.RandomState.randint
File "_bounded_integers.pyx", line 1270, in numpy.random._bounded_integers._rand_int64
ValueError: low >= high
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