title: What are "inheritable alternative constructors"?
body: <p>I stumbled over the term <strong>"inheritable alternative constructors</strong>" in this answer: <a href="https://stackoverflow.com/a/1669524/633961">https://stackoverflow.com/a/1669524/633961</a></p>
  
  <p>The link points to a place where <code>classmethod</code> gets explained.</p>
  
  <p>Do other programming languages have this feature, too?</p>