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

诸神缄默不语-个人CSDN博文目录

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 randintreturn self.randrange(a, b+1)File "mypath/lib/python3.8/random.py", line 226, in randrangeraise 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。

参考资料：

ValueError: empty range for randrange() (1,1, 0)_醉小义的博客-CSDN博客
random.randint()的官方文档

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