title: Is code clone a common practice in C,Java and Python?
body: <p>Code clones, also known as <a href="http://en.wikipedia.org/wiki/Duplicate_code" rel="nofollow">Duplicate code</a> is often considered harmful to the system quality.</p>
  
  <ol>
  <li>I'm wondering whether these duplicate code could be seen in standard APIs or other mature tools.</li>
  <li>If it is indeed the case, then which language(such like C,Java,Python,common lisp etc.) do you think should introduce <code>code clone</code> practice with a higher probability?</li>
  </ol>