title: python getattr from class method, why is it not finding the other class method?
body: <pre><code>class Dog(object):
      def __init__(self):
          self.type = 'corgi'
          self.barked = False
      def __bark(self):
          print('__woof')
          self.barked = True
      def _bark(self):
          print('_woof')
          self.barked = True
      def call_method(self, method_name):
          method = getattr(self, method_name)()
  d = Dog()
  d.call_method('_bark')  # this works
  d.call_method('__bark')  # this raise an AttributeError
  </code></pre>
  
  <p>I have a dog class where I want to use getattr to dynamically find a method under self
  When I try to find the method name of a class with two underscores is fails but if I use one underscore it works.
  Why is the double underscore method not seen by getattr?</p>