// main.go
package main

func main() {}

// cstuff/cstuff.go
package cstuff

import (
  "fmt"
  "C"
)

//export TestFunction
func TestFunction() {
  fmt.Println("Hello World")
}

// test.py
from ctypes import *
test = cdll.LoadLibrary("./test.so")
test.TestFunction()

go install -buildmode=shared -linkshared std
go build -buildmode=c-shared -linkshared -o test.so .
# Library looks OK
❯ ldd ./test.so
	linux-vdso.so.1 (0x00007fff59d19000)
	libstd.so => /usr/lib/go-1.20/pkg/linux_amd64_dynlink/libstd.so (0x00007f6a9b394000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f6a9b168000)
	libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007f6a9b14c000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f6a9b146000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f6a9b123000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f6a9e0dc000)
	
❯ python ./test.py
Traceback (most recent call last):
  File "./test.py", line 3, in <module>
    test = cdll.LoadLibrary("./test.so")
  File "/usr/lib/python3.8/ctypes/__init__.py", line 451, in LoadLibrary
    return self._dlltype(name)
  File "/usr/lib/python3.8/ctypes/__init__.py", line 373, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: /usr/lib/go-1.20/pkg/linux_amd64_dynlink/libstd.so: undefined symbol: main.main