How to call python script in UIVision

Hi im trying to call python script with xRunAndWait.
But it says [error] Disconnected. Any ideas?

{
  "Name": "test",
  "CreationDate": "2019-10-30",
  "Commands": [
        {
          "Command": "XRunAndWait",
          "Target": "python3",
          "Value": "/home/jyri/Desktop/test.py"
        },
        {
          "Command": "store",
          "Target": "${!xrun_exitcode}",
          "Value": "strng"
        },
        {
          "Command": "echo",
          "Target": "${strng}",
          "Value": ""
        }
      ]
    }


import sys

def read_file():
	with open("/home/jyri/Desktop/test.txt") as reader:
		strng = reader.readlines()
		print(strng)
	sys.exit(strng)


if __name__ == "__main__":
	read_file()