title: Delete attribute from class instance python
body: <p>I have example class:</p>
  
  <pre><code>class A():
      other_attribute = 2
      def __init__(self):
          setattr(A,"my_attribute",1)
  
  a = A()
  </code></pre>
  
  <p>How can I delete <code>my_attribute</code> and <code>other_attribute</code> from instance?</p>
  
  <p>PS. I edited code to better explain problem. For example I have class, which dynamically adds attributes</p>
  
  <pre><code>class A():
      def __init__(self, attribute_name, attribute_value):
          setattr(A, attribute_name, attribute_value)
  
  a = A("my_attribute", 123)
  </code></pre>
  
  <p>I created <code>my_attribute</code>, in instance <code>a</code>, but then I do not need it anymore. But at other instances are other attributes, which I do not want to change.</p>