Find the center of a set of points using this bounding box class in python

bbox.py

class BoundingBox(coordinate_list):
    """
    Return a 2D bounding box from a set of points
    Example input:  mypoints = [(0,2),(3,4),(5,6)]
    Example Usage: BoundingBox(mypoints)
    Example Usage: bbox = BoundingBox(mypoints)
    bbox.width
    bbox.height
    bbox.centroid
    """
    def __init__(self, points):
        if len(points) == 0:
            raise ValueError("Can't compute bounding box of empty list")
        self.minx, self.miny = float("inf"), float("inf")
        self.maxx, self.maxy = float("-inf"), float("-inf")
        for x, y in points:
            # Set min coords
            if x < self.minx:
                self.minx = x
            if y < self.miny:
                self.miny = y
            # Set max coords
            if x > self.maxx:
                self.maxx = x
            elif y > self.maxy:
                self.maxy = y
    @property
    def width(self):
        return self.maxx - self.minx
    @property
    def height(self):
        return self.maxy - self.miny
    @property
    def centroid(self):
        xdist = (self.maxx - self.minx)/2.0 +self.minx
        ydist = (self.maxy - self.miny)/2.0 +self.miny
        return [xdist, ydist]
    def __repr__(self):
        return (self.minx, self.miny, self.maxx, self.maxy)