Well, I didn't downvote it, but you can't do this with _everything_ in Python, like you can in Ruby.<p><pre><code>    $ irb
    irb(main):001:0&#62; class Numeric
    irb(main):002:1&#62;   def wtf
    irb(main):003:2&#62;     puts "hey"
    irb(main):004:2&#62;   end
    irb(main):005:1&#62; end
    =&#62; nil
    irb(main):006:0&#62; 5.wtf
    hey
    =&#62; nil</code></pre>