title: Cannot Split, A bytes-like object is required, not 'str'
body: <p>I am trying to write a tshark (or any shell command for that matter) to a file. I've tried using decode and encode but it still yells at me that the split method cannot use the datatype. My attempts are still in the code as comments, after the "capturing stopped" line. I have also tried r, a and a+ as the open modes  but I actually get output with the ab+ mode used here so I opted to keep it. Even using a+ mode said "blah" was bytes. I would like to keep the file appended with the output. Thank you!</p>
  
  <pre><code>import subprocess
  import datetime
  
  x="1"
  x=input("Enter to continue. Input 0 to quit")
  while x != "0":
      #print("x is not zero")
      blah = subprocess.check_output(["tshark -i mon0 -f \"subtype probe-req\" -T fields -e wlan.sa -e wlan_mgt.ssid -c 2"], shell=True)
      with open("results.txt", 'ab+') as f:
          f.write(blah)
      x=input("To get out enter 0")
  print("Capturing Stopped")
  
  # blah.decode()
  #blah = str.encode(blah)
  
  #split the blah variable by line
  splitblah = blah.split("\n")
  
  #repeat  for each line, -1 ignores first line since it contains headers
  for value in splitblah[:-1]:
  
      #split each line by tab delimiter
      splitvalue = value.split("\t")
  
  #Assign variables to split fields
  MAC = str(splitvalue[1])
  SSID = str(splitvalue[2])
  time = str(datetime.datetime.now())
  
  #write and format output to results file
  with open("results.txt", "ab+") as f:
      f.write(MAC+" "+SSID+" "+time+"\r\n")
  </code></pre>