WARNING: qpsolvers 4.8.1 does not provide the extra ‘open_source_solvers’

Problem

When entering

pip install qpsolvers[open_source_solvers]

The qpsolvers are not installed and a warning is given

WARNING: qpsolvers 4.8.1 does not provide the extra 'open_source_solvers'

Solution

You need to use dashes instead of underscores

So use the following instead

pip install qpsolvers[open-source-solvers]