title: TypeError: 'in <string>' requires string as left operand, not list (Function)
body: <pre><code>variableName=["display","screen","sound""audio"]
  fileName=["PPP", "Abc"]
  P1="PPP"
  d="display"
  s="screen"
  ss="sound"
  a="audio"
  d=P1
  loop=True
  def CH(variableName, fileName, loop):
      while loop==True:
          Up=input("What is your problem?\n")
          if (variableName) in Up.lower():
              file = open(fileName + ".txt", "r")
              whole= file.read()
              print(whole)
              file.close()
              loop=False
          else:
              loop=True
              continue**
  
  CH(variableName, fileName, loop)
  </code></pre>
  
  <p>I am trying to create a function that read your input and give an answer by using keywords. But the error ""TypeError: 'in ' requires string as left operand, not list"" keeps coming up and I can seem to fix it</p>