For Python, wrap all input strings in double quotes.

[dpgrote]

This avoids problems when there are spaces in the expressions.

[EZoni]

Note that our CI tests in the Azure DevOps pipelines did not run for this PR, neither in https://dev.azure.com/BLAST-WarpX/WarpX/_build?definitionId=1 nor in https://dev.azure.com/ECP-WarpX/WarpX/_build?definitionId=3.*

You could retrigger CI now (e.g., git commit --amend, then git push -f) and I expect that the CI tests should run in at least one of the two pipelines.

*We are working on resolving the redundancy in the pipelines and any related issues.

[EZoni]

I think Azure was still broken at the time of the last (merge) commit here. Now it should be fixed. I think we need to retrigger the CI checks one more time.