How to upgrade a python package with pip?
I'm trying to set up QuantLib and PyQL on cloud.sagemath. QuantLib builds out of the box. For PyQL, I need Cython >0.18; installed version is 0.15. If I try a local install:
pip install --user --upgrade --ignore-installed cython
pip tries to uninstall the system version, which of course fails. Any idea how to proceed?