Hi! It looks like PEP 498 (f-strings) is going to be accepted soon. Anyone interested in implementing it for Cython? https://www.python.org/dev/peps/pep-0498/ It's certainly a bit of work, but it's also very much Python-level functionality and most of it can be handled in the parser, so I would count it as an entry-level project for working on Cython. There is already an initial implementation for CPython (in C) which should provide an answer to the tricky details of the functionality itself, as well as tests for it (eventually). https://bugs.python.org/issue24965 So, if this feature, and if extending the Cython language and working on a real compiler sounds tempting to you, please speak up on the cython-devel mailing list. Stefan