Merge pull request #955 from jsyeo/berkeley-sicp

Add berkeley's sicp in python course

free-courses-en.md

@@ -56,6 +56,7 @@
 
 ###Python
 * [Google's Python Course](https://developers.google.com/edu/python/)
+* [Berkeley's Structure and Interpretation of Computer Programs](http://www-inst.eecs.berkeley.edu/~cs61a/)
 
 
 ###Ruby