The 297 loc for scala pro is from the paper that also includes 13 lines of Apache license stuff on the top and 14 lines of comments. The author used "wc -l" to

The 297 loc for scala pro is from the paper that also includes 13 lines of Apache license stuff on the top and 14 lines of comments. The author used "wc -l" to count the LOC, that's not very scientific anyway. The 626 loc for python is also from "wc -l". I looked at the code again and found out it contains a lot of detailed comments and even test cases, so it's not fair to say the python version has 626 loc. I suspect the author gives it out as a reference implementation.