OK

• http://cs61a.org
• http://data8.org/
• http://cs168.io
• https://github.com/okpy/ok
• https://www.youtube.com/watch?v=pp8DSTDTdb8&rel=0
• https://www.youtube.com/watch?v=-EWJ6s2_cPE&rel=0
• https://www.youtube.com/watch?v=PFTm7hmnKho&rel=0
• https://www.youtube.com/watch?v=polTBnMXGQI&rel=0
• https://www.youtube.com/watch?v=97paBo_U_vY&rel=0