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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _initialize(self):
        '''
        We override _initialize, as we want to resolve the field each time
        '''
        if self._field_name:
            self._field = self.resolve_field(self._field_name)
        if not self._field:
            raise KittyException('Could not resolve field name %s' % self._field_name)