title: Are open(file, "wt" or "rt") different objects?
body: <p>When you do:</p>
  
  <pre><code>file = open("my file","wt")
  </code></pre>
  
  <p>and</p>
  
  <pre><code>file = open("my file" , "rt")
  </code></pre>
  
  <p>These both create file objects that we use file methods on. But are they creating different file objects? And if they are creating different file objects would it be fair to say that the "wt" one is mutable, while the "rt" one is immutable?</p>