title: How can I capitalize a substring in a string in Python?
body: <pre><code>string = raw_input("Please enter a string:")
  string = string.lower()
  print string
  substring = raw_input("Please enter a substring:")
  </code></pre>
  
  <p>That's where I am in the code so far, I have to capitalize the substring that the user has put in but I have no clue how.</p>