**Bug description / feature request:** Many docstrings in struphy contain (single) backslashes, which produces warnings like this: ``` > struphy --refresh-models Collecting available models ... /raven/u/maxlin/git_repos/struphy/src/struphy/feec/preconditioner.py:394: SyntaxWarning: invalid escape sequence '\h' """ /raven/u/maxlin/git_repos/struphy/src/struphy/feec/preconditioner.py:700: SyntaxWarning: invalid escape sequence '\h' """ /raven/u/maxlin/git_repos/struphy/src/struphy/feec/preconditioner.py:732: SyntaxWarning: invalid escape sequence '\h' """ Done. ``` Example from pipeline: https://gitlab.mpcdf.mpg.de/struphy/struphy/-/jobs/3170959/viewer#L948 Error description on ruff: https://docs.astral.sh/ruff/rules/escape-sequence-in-docstring/ **Proposed solution:** [PEP 257](https://peps.python.org/pep-0257/#what-is-a-docstring) recommends the use of raw strings (i.e., `r"""raw triple double quotes"""`) for docstrings that include backslashes. This is also discussed [here](https://stackoverflow.com/questions/16468397/math-expression-in-docstring-is-not-rendered-correctly-by-sphinx) (specifically related to including latex in the docstring to be parsed by sphinx, the proposed solution is to use raw strings. From [sphinx documentation](https://www.sphinx-doc.org/en/master/usage/restructuredtext/directives.html#math): > Keep in mind that when you put math markup in **Python docstrings** read by [**`autodoc`**](https://www.sphinx-doc.org/en/master/usage/extensions/autodoc.html#module-sphinx.ext.autodoc "sphinx.ext.autodoc: Include documentation from docstrings."), you either have to double all backslashes, or use Python raw strings (`r"raw"`).