Well, I didn't downvote it, but you can't do this with _everything_ in Python, like you can in Ruby.

    $ irb
    irb(main):001:0> class Numeric
    irb(main):002:1>   def wtf
    irb(main):003:2>     puts "hey"
    irb(main):004:2>   end
    irb(main):005:1> end
    => nil
    irb(main):006:0> 5.wtf
    hey
    => nil