Apply a method to an object of another class
<p>Given two non-related classes A and B, how to call <code>A.method</code> with an object of B as <code>self</code>?</p>

<pre><code>class A:
    def __init__(self, x):
        self.x = x

    def print_x(self):
        print self.x

class B:
    def __init__(self, x):
        self.x = x

a = A('spam')
b = B('eggs')

a.print_x() #&lt;-- spam
&lt;magic&gt;(A.print_x, b) #&lt;-- 'eggs'
</code></pre>
