For Ruby, I enjoyed http://rubykoans.com http://rubykoans.com . There is a python port (which I haven't tried) at https://github.com/gregmalcolm/python_koans h

For Ruby, I enjoyed http://rubykoans.com http://rubykoans.com . There is a python port (which I haven't tried) at https://github.com/gregmalcolm/python_koans https://github.com/gregmalcolm/python_koans .