For those still running 2.7 because migrating is too hard, consider using my "ppython" version (https://github.com/nascheme/ppython https://github.com/nascheme/

For those still running 2.7 because migrating is too hard, consider using my "ppython" version (https://github.com/nascheme/ppython https://github.com/nascheme/ppython). It is a modified version of 3.6 with extra backwards compatibility features. After running your code through 2to3, it should mostly work with ppython. After fixing all the runtime warnings, your code should work with regular 3.6.