title: How to draw circle by data with matplotlib + python?
body: <p>I can draw a circle by <code>scatter</code>, which has been shown in the image. But I want to draw them buy a line, because there are many circles in total, I need to link nodes together for a certain circle. Thanks.
  <img src="https://i.stack.imgur.com/MysQT.png" alt="enter image description here"></p>