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copied!<p>Couple things:</p> <ol> <li>Your class is named <code>Bar</code> but you're calling it as <code>bar(a, b)</code>. Change that to <code>Bar(a, b)</code> to solve this problem.</li> <li>Classes need to inherit from something (if nothing, then <code>object</code>). You need <code>class Bar(object):</code></li> <li>Instance methods, in Python, are always supplied one parameter, which is the object itself, before other passed parameters. So your <code>def __init__(num1, num2):</code> should be <code>def __init__(self, num1, num2):</code>, and the same for <code>def foo()</code>.</li> <li>All of your instance variables need to be prefixed by <code>self.</code>. So <code>num1</code> should be <code>self.num1</code>, etc.</li> <li>The <code>^</code> operator is boolean XOR. Not sure if this is what you want, it's often confused with the power operator, <code>**</code>.</li> </ol> <p>Here's your example, cleaned up and fixed accordingly:</p> <pre><code>class Bar(object): num1, num2 = 0, 0 def __init__(self, num1, num2): self.num1, self.num2 = num1, num2 def foo(self): if self.num1 > self.num2: print self.num1,'is greater than ',self.num2,'!' elif self.num1 is self.num2: print self.num1,' is equal to ',self.num2,'!' else: print self.num1,' is less than ',self.num2,'!' a, b = 42, 84 t = Bar(a, b) t.foo() t.num1 = t.num1 ^ t.num2 t.num2 = t.num2 ^ t.num1 t.num1 = t.num1 ^ t.num2 t.foo() </code></pre> <p>And the result:</p> <pre><code>42 is less than 84 ! 84 is greater than 42 ! </code></pre>

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