[Python] Using python CDLL to load dll, but no function from c code show up

I'm trying to import function written in c code into python. A minimal example I have tried is

//test.h
__declspec(dllexport) int HW(int, int);


//test.c
#include <stdio.h>
#include <stdlib.h>
#include "test.h"

__declspec(dllexport) int HW(int a, int b)
{
return a + b;
}


I also tried to remove the __declspec(dllexport) in either files. Then I did the following in Visual Studio 2019 CMD

cl /LD test.c


or

cl /LD test.c \libs\python37.lib


In python I did

from ctypes import *
a = CDLL('test.dll')


It turns out that HW is not an attribute of a. Which part did I do wrong?

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