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gh-104469: Update README.txt for _testcapi (gh-104529)

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* gh-104469: Update README.txt for _testcapi

Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>
Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>
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Dong-hee Na 2023-05-17 12:56:20 +09:00 committed by GitHub
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Modules/_testcapi/README.txt
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Tests in this directory are compiled into the _testcapi extension.
The main file for the extension is Modules/_testcapimodule.c, which
calls `_PyTestCapi_Init_*` from these functions.
General guideline when writing test code for C API.
* Use Argument Clinic to minimise the amount of boilerplate code.
* Add a newline between the argument spec and the docstring.
* If a test description is needed, make sure the added docstring clearly and succinctly describes purpose of the function.
* DRY, use the clone feature of Argument Clinic.
* Try to avoid adding new interned strings; reuse existing parameter names if possible. Use the `as` feature of Argument Clinic to override the C variable name, if needed.