why "{}".format(somevariable) is used in many places instead of f"{variable}" formatter?

[nikhil-swamix]

is it a coding style or has performance benefits? just curious as f"{variable}" is very intuitive than the format sting referred earlier.

[msiemens]

Well, the answer is relatively simple: f-strings were introduced in Python 3.6 which means that Python 3.5 was the most recent version that did not support f-strings. Python 3.5 however was still supported up until September 2020 (see https://endoflife.date/python) and the code that uses format was written before that and hasn't been updated since 🙃 If you like, you can create a pull request that replaces the format calls with f-strings 🙂