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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?

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?