random-randint和numpy中的同名函数不同

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