<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def to_dict(self):
 """ Return the node as a dictionary. Returns ------- dict: All the attributes of this node as a dictionary (minus the left and right). """

        out = {}
        for key in self.__dict__.keys():
            if key not in ['left', 'right', 'missing', 'parent']:
                out[key] = self.__dict__[key]
        return out