title: Replace the first word in a string
body: <p>I am trying to replace the first word in a string, though it is not working. Any help?</p>
  
  <pre><code>s = 'No word in this sentence is                 
  capitalised.'
  
  replacement = 'All'
  s.split()
  s.replace(s,replacement,0)
  print(s)
  </code></pre>