title: How can I use if loop to grep a word from txt file using python?
body: <p>I am currently using <code>if "not" or "missing" in temp_reader:</code> </p>
  
  <p>However, it looks like it is not working. 
  It always go inside of the if loop even if <code>not</code> or <code>missing</code> is not there. </p>
  
  <p>How can I fix this, so that it only foes inside of the loop if a text file contains <code>not</code> or <code>missing</code>? </p>