Page 53

#define PY_SSIZE_T_CLEAN

#include <Python.h>

static PyObject * add(PyObject *self, PyObject *args)

{

int x, y, sts;

if (!PyArg_ParseTuple(args, "ii", &x, &y))

return NULL;

sts = x+y;

return PyLong_FromLong(sts);

}

static PyMethodDef AddMethods[] = {

{"add", add, METH_VARARGS, "add two numbers"},

{NULL, NULL, 0, NULL} // sentinel

};

static struct PyModuleDef addmodule = {

PyModuleDef_HEAD_INIT,

"arith",

"C library for sum",

-1,

AddMethods

};

PyMODINIT_FUNC PyInit_arith(void) {

return PyModule_Create(&addmodule);

}

Page 54 and on

Arith.c

#define PY_SSIZE_T_CLEAN

#include <Python.h>

static PyObject * Pi(PyObject *self, PyObject *args)

{

int m, n;

double pi,s;

if (!PyArg_ParseTuple(args, "ii", &m, &n))

return NULL;

pi=0;

for(int k=m;k<n;k++){

s=1;

if(k%2==0)s=-1;

pi=pi+s/(2*k-1);

}

return PyFloat_FromDouble(4*pi);

}

static PyMethodDef AddMethods[] = {

{"myPi", Pi, METH_VARARGS, "Compute Pi"},

{NULL, NULL, 0, NULL} // sentinel

};

static struct PyModuleDef addmodule = {

PyModuleDef_HEAD_INIT,

"Pi",

"C library to compute Pi",

-1,

AddMethods

};

PyMODINIT_FUNC PyInit_Pi(void) {

return PyModule_Create(&addmodule);

}

tasks.json LINUX

{

"tasks": [

{

"type": "cppbuild",

"label": "C/C++: gcc-10 build active file",

"command": "/usr/bin/gcc-10",

"args": [

"-fdiagnostics-color=always",

"-g",

"-shared",

"${file}",

"-o",

"Pi.so",

"-I/usr/local/include/python3.11"

],

"options": {

"cwd": "${fileDirname}"

},

"problemMatcher": [

"$gcc"

],

"group": {

"kind": "build",

"isDefault": true

},

"detail": "Task generated by Debugger."

}

],

"version": "2.0.0"

}

c_cpp_properties.json LINUX

{

"configurations": [

{

"name": "Linux",

"includePath": [

"${workspaceFolder}/**",

"/usr/local/include/**"

],

"defines": [],

"compilerPath": "/usr/bin/gcc",

"cStandard": "c17",

"cppStandard": "gnu++14",

"intelliSenseMode": "linux-gcc-arm"

}

],

"version": 4

}

launch.json LINUX

{

"version": "0.2.0",

"configurations": [

{

"name": "Python: Current File",

"type": "python",

"request": "launch",

"program": "${file}",

"console": "integratedTerminal"

},

{

"name": "(gdb) Attach",

"type": "cppdbg",

"request": "attach",

"program": "/usr/local/bin/python3.11",

"processId": "${command:pickProcess}",

"MIMode": "gdb",

"setupCommands": [

{

"description": "Enable pretty-printing for gdb",

"text": "-enable-pretty-printing",

"ignoreFailures": true

}

]

}

]

}

tasks.json WINDOWS - CHANGE USER IN PATH

{

"tasks": [

{

"type": "cppbuild",

"label": "C/C++: cl.exe build active file",

"command": "cl.exe",

"args": [

"/Zi",

"/EHsc",

"/nologo",

"/IC:/Users/mike.james/AppData/Local/Programs/Python/Python311/include",

"${file}",

"/link /dll /OUT:arith.pyd /LIBPATH:C:/Users/mike.james/AppData/Local/Programs/Python/Python311/libs"

],

"options": {

"cwd": "${fileDirname}"

},

"problemMatcher": [

"$msCompile"

],

"group": {

"kind": "build",

"isDefault": true

},

"detail": "Task generated by Debugger."

}

],

"version": "2.0.0"

}

c_cpp_properties.json WINDOWS CHANGE USER IN PATH

{

"configurations": [

{

"name": "Win32",

"includePath": [

"${workspaceFolder}/**",

"C:/Users/mike.james/AppData/Local/Programs/Python/Python311/include/"

],

"defines": [

"_DEBUG",

"UNICODE",

"_UNICODE"

],

"windowsSdkVersion": "10.0.22000.0",

"compilerPath": "cl.exe",

"cStandard": "c17",

"cppStandard": "c++17",

"intelliSenseMode": "windows-msvc-x64"

}

],

"version": 4

}

launch.json WINDOWS CHANGE USER IN PATH

{

"version": "0.2.0",

"configurations": [

{

"name": "(Windows) Attach",

"type": "cppvsdbg",

"request": "attach",

"processId": "${command:pickProcess}",

"symbolSearchPath": "C:/Users/mike.james/AppData/Local/Programs/Python/Python-3.11.4",

"sourceFileMap":{"D:/a/1/s/":"C:/Users/mike.james/AppData/Local/Programs/Python/Python311"},

},

{

"name": "Python: Current File",

"type": "python",

"request": "launch",

"program": "${file}",

"console": "integratedTerminal"

}

]

}

Py.py

import time

def myPi(m,n):

pi=0

for k in range(m,n+1):

s= 1 if k%2 else -1

pi += s / (2 * k - 1)

return 4*pi

if __name__ == '__main__':

N=10000000

t1=time.perf_counter()

pi=myPi(1,N)

t2=time.perf_counter()

print((t2-t1)*1000)

print(pi)

Py1.py

import Pi

import time

if __name__ == '__main__':

N=10000000

t1=time.perf_counter()

pi=Pi.myPi(1,N)

t2=time.perf_counter()

print((t2-t1)*1000)

print(pi)

Page 57

example.c

#define PY_SSIZE_T_CLEAN

#include <Python.h>

static PyObject* exampleFunction(PyObject *self, PyObject *args)

{

//example function code

}

static PyMethodDef AddMethods[] = {

{"exampleFunction", exampleFunction, METH_VARARGS, "an example"},

{NULL, NULL, 0, NULL} // sentinel

};

static struct PyModuleDef addmodule = {

PyModuleDef_HEAD_INIT,

"example",

"C library to test API",

-1,

AddMethods

};

PyMODINIT_FUNC PyInit_example(void) {

return PyModule_Create(&addmodule);

}