https://github.com/python/cpython/commit/fd6085529935afec085cea0729507ba6d4b... commit: fd6085529935afec085cea0729507ba6d4b34ab3 branch: 3.12 author: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> committer: erlend-aasland <erlend.aasland@protonmail.com> date: 2023-07-31T21:42:58Z summary: [3.12] gh-107507: Replace 'The goals of Argument Clinic' with a summary (GH-107508) (#107516) Summarise the goals of Argument Clinic in a single sentence. Mention that Argument Clinic was introduced with PEP-436. (cherry picked from commit abb71c6a8f73482c910ffdf050a86089a48e0e60) Co-authored-by: Erlend E. Aasland <erlend@python.org> files: M Doc/howto/clinic.rst diff --git a/Doc/howto/clinic.rst b/Doc/howto/clinic.rst index 7aafd48711b58..9c9a4f45dd0f5 100644 --- a/Doc/howto/clinic.rst +++ b/Doc/howto/clinic.rst @@ -13,8 +13,10 @@ Argument Clinic How-To .. topic:: Abstract Argument Clinic is a preprocessor for CPython C files. - Its purpose is to automate all the boilerplate involved - with writing argument parsing code for "builtins", + It was introduced in Python 3.4 with :pep:`436`, + in order to provide introspection signatures, + and to generate performant and tailor-made boilerplate code + for argument parsing in CPython builtins, module level functions, and class methods. This document is divided in four major sections: @@ -44,58 +46,6 @@ Argument Clinic How-To Background ========== - -The goals of Argument Clinic ----------------------------- - -Argument Clinic's primary goal -is to take over responsibility for all argument parsing code -inside CPython. This means that, when you convert a function -to work with Argument Clinic, that function should no longer -do any of its own argument parsing—the code generated by -Argument Clinic should be a "black box" to you, where CPython -calls in at the top, and your code gets called at the bottom, -with ``PyObject *args`` (and maybe ``PyObject *kwargs``) -magically converted into the C variables and types you need. - -In order for Argument Clinic to accomplish its primary goal, -it must be easy to use. Currently, working with CPython's -argument parsing library is a chore, requiring maintaining -redundant information in a surprising number of places. -When you use Argument Clinic, you don't have to repeat yourself. - -Obviously, no one would want to use Argument Clinic unless -it's solving their problem—and without creating new problems of -its own. -So it's paramount that Argument Clinic generate correct code. -It'd be nice if the code was faster, too, but at the very least -it should not introduce a major speed regression. (Eventually Argument -Clinic *should* make a major speedup possible—we could -rewrite its code generator to produce tailor-made argument -parsing code, rather than calling the general-purpose CPython -argument parsing library. That would make for the fastest -argument parsing possible!) - -Additionally, Argument Clinic must be flexible enough to -work with any approach to argument parsing. Python has -some functions with some very strange parsing behaviors; -Argument Clinic's goal is to support all of them. - -Finally, the original motivation for Argument Clinic was -to provide introspection "signatures" for CPython builtins. -It used to be, the introspection query functions would throw -an exception if you passed in a builtin. With Argument -Clinic, that's a thing of the past! - -One idea you should keep in mind, as you work with -Argument Clinic: the more information you give it, the -better job it'll be able to do. -Argument Clinic is admittedly relatively simple right -now. But as it evolves it will get more sophisticated, -and it should be able to do many interesting and smart -things with all the information you give it. - - Basic concepts --------------