ValueError: empty range for randrange() (1,1, 0)

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错误：random的下标  第一个大于第二个

>>> random.randint(1,0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/nianxiongdi/anaconda3/lib/python3.6/random.py", line 221, in randint
    return self.randrange(a, b+1)
  File "/home/nianxiongdi/anaconda3/lib/python3.6/random.py", line 199, in randrange
    raise ValueError("empty range for randrange() (%d,%d, %d)" % (istart, istop, width))
ValueError: empty range for randrange() (1,1, 0)