Sage code for computing with vector-valued modular forms, Jacobi forms and theta lifts.
First enter git clone https://github.com/btw-47/weilrep.git
Then install by typing sage --python weilrep/setup.py install --user
You can also use this code in CoCalc without installing Sage. Open a project and create a new folder named 'weilrep'. Copy all files from the /weilrep folder into the CoCalc project. Finally, navigate up (out of the 'weilrep' folder) and open a Sage worksheet in your home directory.
After installing, open Sage and type
from weilrep import *
Please see the file weilrep_readme.pdf for an overview of the functions.