test.py

class attrExample(d:

    def __getattr__(self, item):
        """
        Returns the attr if it's part of attrExample, otherwise 
        return the attr from foo
        """
        try:
            return self.item
        except KeyError:
            return foo.item

class attrExample():

  def __getattr__(self, foo):
    """
    Returns the attr if it's part of attrExample, otherwise
    return the attr from foo
    """
    try:
      return self.item
    except KeyError:
      return foo.item