title: Constantly checking a variable Python
body: <p>Started trying to learn python yesterday, and I have run into a wall already T.T. 
  I am trying to make a health function in a game in python, and I need the variable health checked constantly to make sure it does not go below 0.</p>
  
  <pre><code>health = 10
  
  health = (health - 5)
  
  health = (health - 6)
  </code></pre>
  
  <p>Here I need the program to run a completely separate line of code, since health is now equal to -1. I do not want to have </p>
  
  <pre><code>if(health &lt;= 0):
  
      ...
  </code></pre>
  
  <p>because I would need to copy paste this everywhere health is changed.</p>
  
  <p>Would appreciate any help, thanks!</p>