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POpython: what prevents from object destroy?
 

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    <p>If you define a class instance in a function, when the function exits, the instance will be automatically destroyed due to out of scope. This can be simply verified by a small program:</p> <pre><code>class A(object): def __del__(self): print 'deleting A ', id(self) class B(A): def __init__(self): self.a = A() def __del__(self): print 'deleting B ', id(self) super(B, self).__del__() def test(): b = B() print 'this is ', b test() </code></pre> <p>The output is:</p> <pre><code>this is &lt;__main__.B object at 0x01BC6150&gt; deleting B 29122896 deleting A 29122896 deleting A 29122960 </code></pre> <p>But I'm encountering a weird problem. When I inherit a class from novaclient, the instance will never be automatically destroyed.</p> <pre><code>from novaclient.v1_1.client import Client as NovaClient class ViviNovaClient(NovaClient): def __init__(self, auth_token, url, tenant_id): super(ViviNovaClient, self).__init__(None, None, tenant_id, auth_url = 'http') self.client.management_url = url self.client.auth_token = auth_token self.client.used_keyring = True; LOG.info('creating &lt;ViviNovaClient&gt; %d' % id(self)) def __del__(self): LOG.info('deleting &lt;ViviNovaClient&gt; %d' % id(self)) if __name__ == '__main__': def test(): client = ViviNovaClient('53ef4c407fed45de915681a2d6aef1ee', 'http://135.251.237.130:8774/v2/082d8fd857f44031858827d149065d9f', '082d8fd857f44031858827d149065d9f') test() </code></pre> <p>Output is:</p> <pre><code>2013-05-24 23:08:03 32240 INFO vivi.vivimain.ViviNovaClient [-] creating &lt;ViviNovaClient&gt; 26684304 </code></pre> <p>In this test, 'client' object is not destroyed. So I wonder what will prevent the 'client' object from auto destroying?</p>
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