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

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

运行环境,报错信息、原因和解决方案:

Linux系统,Python3,random包。(在运行过程中使用了其他框架,与本错误无直接关系)


报错信息:


Traceback (most recent call last):
  File "my_path/myscript.py", line 302, in <module>
    i=random.randint(0,len(val_data)-1)
  File "mypath/lib/python3.8/random.py", line 248, in randint
    return self.randrange(a, b+1)
  File "mypath/lib/python3.8/random.py", line 226, in randrange
    raise ValueError("empty range for randrange() (%d, %d, %d)" % (istart, istop, width))
ValueError: empty range for randrange() (0, 0, 0)


问题所在:我发现是因为获取数据(val_data)的过程中出现了问题,导致val_data为空列表,len(val_data)-1为-1,小于0,而random.randint()方法的第二个参数必须大于或等于第1个参数。


解决方式:使randint()的第二个入参大于等于第一个入参,本例中即要求len(val_data)-1>0。

我修改获取数据的代码后,val_data有了元素,len(val_data)-1大于等于0了,就可以正常运行了。


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