Navigate to the repository you cloned and for which you want to install the dependencies.
cdocean4dvarnet
Install package and his depencies in "editable mode", then any change on the code will be seen by python interpreter so that you can see and test your modifications.
pipinstall-e.
Install development dependencies
pipinstall-e.[dev]
The -e option tells pip to install the package in editable mode, meaning that any change done to the source will be reported to the installed package.
The .[dev] argument indicate to install the current folder as a package alongside its optional dependancies, declared as dev in the pyproject.toml file. The quotes around [dev] just allow to escape the sequence in order to not be interpreted by the shell.