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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 set_linkage_method(self, method):
 """ Sets the method to determine the distance between two clusters. :param method: The method to use. It can be one of ``'single'``, ``'complete'``, ``'average'`` or ``'uclus'``, or a callable. The callable should take two collections as parameters and return a distance value between both collections. """

        if method == 'single':
            self.linkage = single
        elif method == 'complete':
            self.linkage = complete
        elif method == 'average':
            self.linkage = average
        elif method == 'uclus':
            self.linkage = uclus
        elif hasattr(method, '__call__'):
            self.linkage = method
        else:
            raise ValueError('distance method must be one of single, '
                             'complete, average of uclus')