Define operator for built-in and class instance
<p>In Python you can override an operation for your class (say, addition) by defining <code>__add__</code>. This will make it possible add class instance with other values/instances, but you can't add built-ins to instances:</p>

<pre><code>foo = Foo()
bar = foo + 6 # Works
bar = 6 + foo # TypeError: unsupported operand type(s) for +: 'int' and 'Foo'
</code></pre>

<p>Is there any way to make enable this?</p>
