I have run Python in its traditional synchronous form, using gevent, and with the more recent async/await syntax. I don’t hold this opinion strongly, but do lean towards async/await syntax for the sake of
explicit is better than implicit [1]. Node.js which was asynchronous from the start also separates async from sync explicitly with, for example, distinct fs.readFile() and fs.readFileSync() functions [2].
[1]: https://www.python.org/dev/peps/pep-0020/ "PEP 20"
[2]: https://nodejs.org/dist/latest-v12.x/docs/api/fs.html#fs_fs_... "Node.js File System"
(Edit: Commenting only on clarity of syntax. Those performance metrics are interesting and I’ve admittedly never hit a scale where the difference has a practical impact.)
