old_contents: from .pointcloud import PointCloud
  import numpy as np
  
  
  def mean_pointcloud(pointclouds):
      r"""
      Compute the mean of a `list` of :map:`PointCloud` objects.
  
      Parameters
      ----------
      pointclouds: `list` of :map:`PointCloud`
          List of point cloud objects from which we want to compute the mean.
  
      Returns
      -------
      mean_pointcloud : :map:`PointCloud`
          The mean point cloud.
      """
      return PointCloud(np.mean([pc.points for pc in pointclouds], axis=0))
  
new_contents: from __future__ import division
  from .pointcloud import PointCloud
  
  
  def mean_pointcloud(pointclouds):
      r"""
      Compute the mean of a `list` of :map:`PointCloud` objects.
  
      Parameters
      ----------
      pointclouds: `list` of :map:`PointCloud`
          List of point cloud objects from which we want to compute the mean.
  
      Returns
      -------
      mean_pointcloud : :map:`PointCloud`
          The mean point cloud.
      """
      return PointCloud(sum(pc.points for pc in pointclouds) / len(pointclouds))
  
subject: Update mean_pointcloud to be faster