Update D2_of_3Day_DoneWithPython.md

MurphyWan · web-flow · commit fe032c9fa4e4 · 2017-09-09T14:38:54.000+08:00
diff --git a/D2_of_3Day_DoneWithPython.md b/D2_of_3Day_DoneWithPython.md
@@ -1389,3 +1389,7 @@ print(sy.diff (g,  y))
 第二天结束，辛苦了
 
 ```
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+[传送门-> 第三天的内容](https://github.com/MurphyWan/Python-first-Practice/blob/master/D_of_3Day_DoneWithPython.md)
