[Coursera] Backup method. python3.4

ref: https://github.com/coursera-dl/coursera-dl
ref:http://www.owstartup.com/2016/06/17/how_to_download_coursera_courses_before_they_are_gone/


start:

1.
pip3 install coursera-dl

2.
go to folder which you want to download

3.
get url of the course you want to download . ex: https://class.coursera.org/prob-001

4. type
coursera-dl -u xxxxxxx@xxxx.com -p xxxxxx prob-001

5. start downloading...