My belief is that the effort os a linear function of your code base size. This means the larger the code base, the more effort required to port. Also, porting

My belief is that the effort os a linear function of your code base size. This means the larger the code base, the more effort required to port. Also, porting is made more difficult by the fact that Python is a dynamic language, so a lot of errors that could be caught at compile time will only be catchable through a thorough testing suite. I have seen little evidence to suggest that porting from Python 2 to 3 is actually straightfoward in the sense of not requiring significant effort proportional to the size of the code base.