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    <p>Because <code>configuration</code> is a class variable and not an instance variable. Fixing this should fix your problem.</p> <pre><code>class container(object): def __init__(self): self.name = 'container' self.configuration = {'var1': 'var1', 'var2': 'var2'} </code></pre> <p>What's going on here is that <code>configuration</code> ends up living in <code>containter.__dict__</code> instead of in the dictionaries of its instances when you make it a class variable. This means that <code>c.configuration</code> is just accessing <code>container.__dict__['configuration']</code> for all instances <code>c</code>.</p> <p>For any class variable, an assignment of the form <code>c.foo = x</code>, creates an entry for <code>foo</code> in <code>c.__dict__</code> which shadows its entry in <code>container.__dict__</code>. So a lookup will return that first. If you delete it, then a lookup will go back to retrieving the class instance. You could do</p> <pre><code>c = container() c.configuration = x </code></pre> <p>and then <code>c.configuration</code> would be whatever <code>x</code> was. But inserting a key isn't an assignment, it's a method call on an existing object accessed through an existing binding.</p> <p>You could get away with making <code>name</code> a class variable but if you want it to change from one instance to another then it should be an instance variable (unless you want a class wide default of course).</p> <p>so:</p> <ol> <li>An assignment (using <code>=</code>, <code>setattr</code> or directly inserting in <code>__dict__</code>) on an instance will shadow a class variable. The class variable is still there.</li> <li>A lookup (calling a method, accessing the value) on an instance will grab an instance attribute if it exists and a class variable otherwise.</li> </ol>
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    1. POWhy is dictionary in object not different from the other?
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    1. COWhy is `name` not a class variable then? Wouldn't I expect that one to change too?
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      1. USPeter Smit
    2. CO@Peter Smit See my update.
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