Python 2to3 Transition

Recently I’ve upgraded one of our biggest projects from Python2.7 to Python3.6, and the process is quite smooth. It tooks me almost 2 days to complete all conversion needed, while other developers were still doing their dail jobs in the project.

Steps I made:

• 1, Run 2to3

• 2, Fix the code so that all the tests passes again.

• 3, Handle outlier cases & write tests for them. Those cases are somewhat related to the diffirences between unicode & str.

Some key notes here:

• 1, Having a solid unit tests system is critical.

• 2, 2to3 did all the heavy works, but you need to know the stuffs to get all the shit done.