Running under python 2.6 produces the error

File "/work/lagrange/ratemodel.py", line 273 as = Ancsplit(self, dist, split, weight=weight) ^ SyntaxError: invalid syntax

This is because 'as' is a keyword in Python 2.6.

In the current snapshot, there is a file decmodel_mp.py which has the same problem.

I a new user of lagrange and I was trying to play a little bit with the example files (psychotria_demo.lagrange.py) in the website and I have the same problem. How can I solve this problem and have lagrange working?

Just open the file with a text editor, search for and replace all occurences of 'as' with something else like 'anc_split'.

that is correct. this is fixed in the newer version, but moving to c++ (faster code, so no longer an issue)