`PCbuild/readme.txt` contains a little paragraph about how to build a static python library.
The resulting static `python.lib` library contains all python C API functions.

Windows DLL's don't allow missing symbols, so C extensions modules must link with a library containing the python C API symbols.
When a C extension links to the static python library, it will contain a copy of all python symbols.
This means that python C symbols are used twice: once by a static python.exe executable, and once for each C extension (_extension.pyw).

Is there a way to use C extensions with a static Windows python.exe wuch that the python symbols are used only once?
Does a statically built Windows python.exe support C extension modules at all?

Thanks

I'm currently working on a conan build recipe for cpython at https://github.com/conan-io/conan-center-index/pull/1510
Fow now, I'm disabling extensions on a static MSVC build.

> Does a statically built Windows python.exe support C extension modules at all?

I've given this some thought in the past, and I suspect the answer is "no" unless you were to also statically link the extension modules into the same executable (which will likely require code modifications).

That may answer the rest of your queries, but perhaps not. I'll have to give those some more thought.

> For now, I'm disabling extensions on a static MSVC build.

This seems like the best option.