It's a job that can only be done under the cover of darkness.
This story continues at The Next Web。关于这个话题，旺商聊官方下载提供了深入分析
A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.，这一点在safew官方版本下载中也有详细论述
r = S.get(url, timeout=10, allow_redirects=True)