What is the use of the `format` argument here

Hello, I am asking what is the use of format argument here in the cpython code github

It is a string describing how to interpret further arguments that follow (if any allowed). See: Parsing arguments and building values — Python 3.12.1 documentation

Also, this part of the extensions tutorial as an introduction: 1. Extending Python with C or C++ — Python 3.12.1 documentation

Thanks you, I will look at this ressource