The .learn()
method will not throw an error if the file you pass it does not exist, and I'm guessing that you are trying to learn patterns from "std-startup.xml"
without having this file in your directory.
Make sure the file std-startup.xml is in the directory you are running your script from. You should also have a directory called standard in your working directory that contains the standard set of aiml files. Basically your directory should look like this:
mydir/my_script.py
mydir/std-startup.xml
mydir/standard/a-bunch-of-std-aiml-files.aiml
These files can be found in the "Other Files/Standard AIML Set/" folder on the pyaiml source forge site. Go to that folder and download the one of the tarballs or the zip.