Python Find Center of Polygon Function

def centroid(vertexes):
     _x_list = [vertex [0] for vertex in vertexes]
     _y_list = [vertex [1] for vertex in vertexes]
     _len = len(vertexes)
     _x = sum(_x_list) / _len
     _y = sum(_y_list) / _len
     return(_x, _y)
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