读取CSV文件中的数据并随即取值，出现object of type 'float' has no len()报错

我想通过读取CSV中的丢失率数据添加信道丢失率，在已经仿照之前为wifi速度设置rate，来写loss设置
，丢失率的数据保存在stats文件夹的lossrate.csv中。运行程序在random库报错,未修改之前或者给直接设置loss=常数，运行正常。请问各位大神，我的程序哪里写错了，我都是仿照着之前的rate定义进行写的。（我自己写的部分已经用注释标出）

Process Process-22:
Traceback (most recent call last):
  File "/usr/lib/python3.6/multiprocessing/process.py", line 258, in _bootstrap
    self.run()
  File "/usr/lib/python3.6/multiprocessing/process.py", line 93, in run
    self._target(*self._args, **self._kwargs)
  File "/home/lingjie/mp-congestion/scenarios/../scripts/multimod.py", line 41, in run
    loss = rand.choice(loss)
  File "/usr/lib/python3.6/random.py", line 258, in choice
    i = self._randbelow(len(seq))
TypeError: object of type 'float' has no len()
Process Process-21:
Traceback (most recent call last):
  File "/usr/lib/python3.6/multiprocessing/process.py", line 258, in _bootstrap
    self.run()
  File "/usr/lib/python3.6/multiprocessing/process.py", line 93, in run
    self._target(*self._args, **self._kwargs)
  File "/home/lingjie/mp-congestion/scenarios/../scripts/multimod.py", line 41, in run
    loss = rand.choice(loss)
  File "/usr/lib/python3.6/random.py", line 258, in choice
    i = self._randbelow(len(seq))
TypeError: object of type 'float' has no len()

你的loss在循环一次后就变成常数了。
不如把loss = rand.choice(loss)改成rloss = rand.choice(loss)试试。