title: How to add text to the end of a line in a string? - Python
body: <p>How can I write some text to the end of a line in a multiple-line string in python, without knowing slice numbers? Here's an example:</p>
  
  <pre><code>mystring="""
  This is a string.
  This is the second Line. #How to append to the end of this line, without slicing?
  This is the third line."""
  </code></pre>
  
  <p>I hope I'm clear.</p>