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pythonpython-3.xgoshared-librariesctypes

Cannot use go shared library in my python file

I have a file called main.go which defines a function called test. I would like to be able to call this function from my python script.

main.go

package main

import "C"

// export test
func test() int {
    return 1
}

func main() {}

compiled with : go build -o lib.so -buildmode=c-shared main.go

main.py

import ctypes

mylib = ctypes.CDLL("./lib.so")


result = mylib.test()


print(result)

when i run the python program i get this error: AttributeError: ./lib.so: undefined symbol: test

What am i missing ?

Go version go version go1.21.3 linux/amd64

Python Version: Python 3.10.12

I tried updating Go (previously I had version 1.21.1)

Solution

  • Everything is correct except // export there is an extra space that creates the problem

    package main

import "C"

//export test      <------ remove the extra space here
func test() int {
    return 1
}

func main() {}

    python main.py

    Output:

    1