def root_at_random_hexagonal_edge(self):
    'Selects a random hexagonal half-edge and makes it the root.'
    self._half_edge = rnd.choice(self.hexagonal_edges)
Selects a random hexagonal half-edge and makes it the root.
def root_at_random_hexagonal_edge(self):
    
    self._half_edge = rnd.choice(self.hexagonal_edges)