Can not convert string to float

Question

I need to get the GPU-Power from a server . This should be done with nvidia-smi.

  def getGpuPower(self):
      splitedGpuPower = os.popen("nvidia-smi --query-gpu=power.draw --format=csv,noheader,nounits").read().replace("\n", ",").split(",")
      for x in range(4):
        self.gpuPower += float(splitedGpuPower[x])
      return self.gpuPower

I need a float number like 250,00

I actually get

(  File "test1.py", line 22, in getGpuPower
    self.gpuPower += float(splitedGpuPower[x])
ValueError: could not convert string to float:)

The output looks like this

$ nvidia-smi --query-gpu=power.draw --format=csv,noheader,nounits

8.50
7.43
11.04

Can you print splitedGpuPower[x] and check if it is actually a float? — Devesh Kumar Singh
– Devesh Kumar Singh, Commented Apr 23, 2019 at 7:42
Please show us the output of the nvidia-smi --query-gpu=power.draw --format=csv,noheader,nounits command. — AKX
– AKX, Commented Apr 23, 2019 at 7:42
Your string is empty, that's why you can't convert it to float: float("") is what you are actually doing here. — cglacet
– cglacet, Commented Apr 23, 2019 at 7:47
You need to iterate on splitedGpuPower without assuming a range, and skip empty strings, check my answer if it makes sense to you! — Devesh Kumar Singh
– Devesh Kumar Singh, Commented Apr 23, 2019 at 7:56

Devesh Kumar Singh · Accepted Answer · 2019-04-23 07:55:07Z

2

Assuming your output of os.popen("nvidia-smi --query-gpu=power.draw --format=csv,noheader,nounits").read() is 8.50\n7.43\n11.04, the following should work.

def getGpuPower():
      #Split on newline
      splitedGpuPower = "8.50\n7.43\n11.04".split("\n")
      gpuPower = 0
      #Iterate through the list
      for power in splitedGpuPower:
          #If string is non empty, convert to float and add
          if power.strip() != '':
              gpuPower += float(power)
      print(gpuPower)

The output will be

getGpuPower()
#26.97

answered Apr 23, 2019 at 7:55

Devesh Kumar Singh

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