【Python】ValueError:Sample larger than population or is negative的原因

ValueError: Sample larger than population or is negative 的原因以及解决办法

1.出现

这几天重构kook-valorant-bot的代码的时候，遇到了这个问题

Job "vip_roll_task (trigger: interval[0:01:20], next run at: 2023-01-25 19:59:21 CST)" raised an exception
Traceback (most recent call last):
  File "/home/muxue/.local/lib/python3.10/site-packages/apscheduler/executors/base_py3.py", line 30, in run_coroutine_job
    retval = await job.func(*job.args, **job.kwargs)
  File "/home/muxue/kook/val-bot/code/main.py", line 793, in vip_roll_task
    ran = random.sample(range(0, len(VipRollDcit[msg_id]['user']) - 1), vnum)
  File "/usr/local/lib/python3.10/random.py", line 482, in sample
    raise ValueError("Sample larger than population or is negative")
ValueError: Sample larger than population or is negative
error raised during task
Traceback (most recent call last):
  File "/home/muxue/.local/lib/python3.10/site-packages/apscheduler/executors/base_py3.py", line 30, in run_coroutine_job
    retval = await job.func(*job.args, **job.kwargs)
  File "/home/muxue/kook/val-bot/code/main.py", line 793, in vip_roll_task
    ran = random.sample(range(0, len(VipRollDcit[msg_id]['user']) - 1), vnum)
  File "/usr/local/lib/python3.10/random.py", line 482, in sample
    raise ValueError("Sample larger than population or is negative")
ValueError: Sample larger than population or is negative

这部分代码是用来生成抽奖结果的随机数的，在网上百度了报错之后，得知是random生成随机数时产生的报错

2.复现

找到对应的代码

ran = random.sample(range(0, len(VipRollDcit[msg_id]['user'])-1), vnum) # 生成n个随机数

这个代码的作用是，生成vnum个从0到len(VipRollDcit[msg_id]['user']) - 1的随机数，不包含len(VipRollDcit[msg_id]['user'])-1

咳咳，这里又发现了另外一个bug：我以为是包含右边界的，所以手动-1了；现在导致最后一个参加抽奖的用户永远都抽不到奖了

标签：random,Python,py,negative,len,sample,range,larger,msg
From： https://blog.51cto.com/musnow/11908614