title: Python - Subtract from Variable
body: <p>I'm working on this project involving variables with numbers. Lets say:</p>
  
  <pre><code>variablename = 5
  </code></pre>
  
  <p>Is there a way that I could subtract, say 2 from the variable, then update said variable so that:</p>
  
  <pre><code> variablename = 3
  </code></pre>