├── .gitignore ├── 01_hello_world ├── Makefile ├── cext01.c ├── cext01.py └── setup.py ├── 02_pointer ├── Makefile ├── cext02.cpp ├── cext02.py └── setup.py ├── 03_filename ├── Makefile ├── cext03.c ├── cext03.py └── setup.py ├── 04_nparray ├── Makefile ├── cext04.c ├── setup.py └── use_cext04.py ├── 05_iterate ├── Makefile ├── cext05.cpp ├── setup.py └── use_cext05.py ├── 06_slice ├── Makefile ├── cext06.cpp ├── setup.py └── use_cext06.py ├── 07_container ├── Makefile ├── cext07.cpp ├── setup.py └── use_cext07.py ├── 08_nparray_stride ├── Makefile ├── cext08.c ├── setup.py └── use_cext08.py ├── 09_sigint ├── Makefile ├── cext09.c ├── cext09.py └── setup.py ├── LICENSE └── README.md /.gitignore: -------------------------------------------------------------------------------- 1 | *~ 2 | 3 | 4 | # Byte-compiled / optimized / DLL files 5 | __pycache__/ 6 | *.py[cod] 7 | *$py.class 8 | 9 | # C extensions 10 | *.so 11 | 12 | # Distribution / packaging 13 | .Python 14 | env/ 15 | build/ 16 | develop-eggs/ 17 | dist/ 18 | downloads/ 19 | eggs/ 20 | .eggs/ 21 | lib/ 22 | lib64/ 23 | parts/ 24 | sdist/ 25 | var/ 26 | *.egg-info/ 27 | .installed.cfg 28 | *.egg 29 | 30 | # PyInstaller 31 | # Usually these files are written by a python script from a template 32 | # before PyInstaller builds the exe, so as to inject date/other infos into it. 33 | *.manifest 34 | *.spec 35 | 36 | # Installer logs 37 | pip-log.txt 38 | pip-delete-this-directory.txt 39 | 40 | # Unit test / coverage reports 41 | htmlcov/ 42 | .tox/ 43 | .coverage 44 | .coverage.* 45 | .cache 46 | nosetests.xml 47 | coverage.xml 48 | *,cover 49 | .hypothesis/ 50 | 51 | # Translations 52 | *.mo 53 | *.pot 54 | 55 | # Django stuff: 56 | *.log 57 | 58 | # Sphinx documentation 59 | docs/_build/ 60 | 61 | # PyBuilder 62 | target/ 63 | 64 | #Ipython Notebook 65 | .ipynb_checkpoints 66 | -------------------------------------------------------------------------------- /01_hello_world/Makefile: -------------------------------------------------------------------------------- 1 | 2 | all: build 3 | 4 | SRC := cext01.c 5 | 6 | build: $(SRC) 7 | python3 setup.py build_ext --inplace 8 | -------------------------------------------------------------------------------- /01_hello_world/cext01.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | #include "Python.h" 4 | 5 | static PyObject* hello(PyObject *self, PyObject *args) 6 | { 7 | printf("Hello World!\n"); 8 | Py_RETURN_NONE; 9 | } 10 | 11 | static PyMethodDef methods[] = { 12 | {"hello", hello, METH_VARARGS, "hello world"}, 13 | {NULL, NULL, 0, NULL} 14 | }; 15 | 16 | static struct PyModuleDef module = { 17 | PyModuleDef_HEAD_INIT, 18 | "cext01", // name of this module 19 | "Print Hello World", // Doc String 20 | -1, 21 | methods 22 | }; 23 | 24 | PyMODINIT_FUNC 25 | PyInit_cext01(void) { 26 | return PyModule_Create(&module); 27 | } 28 | 29 | -------------------------------------------------------------------------------- /01_hello_world/cext01.py: -------------------------------------------------------------------------------- 1 | import cext01 2 | 3 | cext01.hello() 4 | -------------------------------------------------------------------------------- /01_hello_world/setup.py: -------------------------------------------------------------------------------- 1 | from distutils.core import setup, Extension 2 | 3 | setup(name='cext01', 4 | version='0.0.1', 5 | description='c_ext01 hello world', 6 | author='Jun Koda', 7 | url='https://github.com/junkoda/python_c_ext', 8 | ext_modules=[ 9 | Extension('cext01', ['cext01.c']) 10 | ] 11 | ) 12 | 13 | 14 | -------------------------------------------------------------------------------- /02_pointer/Makefile: -------------------------------------------------------------------------------- 1 | 2 | all: build 3 | 4 | SRC := cext02.cpp 5 | 6 | build: $(SRC) 7 | python3 setup.py build_ext --inplace 8 | -------------------------------------------------------------------------------- /02_pointer/cext02.cpp: -------------------------------------------------------------------------------- 1 | // 2 | // Return C/C++ pointer as a Python Object 3 | // 4 | 5 | #include 6 | #include "Python.h" 7 | 8 | static void py_hello_free(PyObject *obj); 9 | 10 | class Hello { 11 | public: 12 | void hello(); 13 | }; 14 | 15 | void Hello::hello() 16 | { 17 | printf("Hello World!\n"); 18 | } 19 | 20 | static PyObject* py_hello_alloc(PyObject *self, PyObject *args) 21 | { 22 | // Allocate a new C++ pointer h as a Python object "_Hello" 23 | Hello* const h= new Hello(); 24 | 25 | return PyCapsule_New(h, "_Hello", py_hello_free); 26 | } 27 | 28 | void py_hello_free(PyObject *obj) 29 | { 30 | // Destructor function for _Hello pointer, called automatically from Python 31 | Hello* const h= (Hello*) PyCapsule_GetPointer(obj, "_Hello"); 32 | 33 | delete h; 34 | } 35 | 36 | PyObject* py_hello(PyObject *self, PyObject *args) 37 | { 38 | // Use _Hello pointer from Python 39 | // _hello(_Hello h) 40 | 41 | PyObject* py_obj; 42 | 43 | if(!PyArg_ParseTuple(args, "O", &py_obj)) 44 | return NULL; 45 | 46 | Hello* h= (Hello*) PyCapsule_GetPointer(py_obj, "_Hello"); 47 | if(!h) return NULL; 48 | 49 | h->hello(); 50 | 51 | Py_RETURN_NONE; 52 | } 53 | 54 | static PyMethodDef methods[] = { 55 | {"hello_alloc", py_hello_alloc, METH_VARARGS, "allocate a Hello object"}, 56 | {"hello", py_hello, METH_VARARGS, "allocate a Hello object"}, 57 | {NULL, NULL, 0, NULL} 58 | }; 59 | 60 | static struct PyModuleDef module = { 61 | PyModuleDef_HEAD_INIT, 62 | "cext02", // name of this module 63 | "Use C/C++ pointer", // Doc String 64 | -1, 65 | methods 66 | }; 67 | 68 | PyMODINIT_FUNC 69 | PyInit_cext02(void) { 70 | return PyModule_Create(&module); 71 | } 72 | 73 | -------------------------------------------------------------------------------- /02_pointer/cext02.py: -------------------------------------------------------------------------------- 1 | import cext02 2 | 3 | h = cext02.hello_alloc() 4 | 5 | cext02.hello(h) 6 | 7 | 8 | -------------------------------------------------------------------------------- /02_pointer/setup.py: -------------------------------------------------------------------------------- 1 | from distutils.core import setup, Extension 2 | 3 | setup(name='cext02', 4 | version='0.0.1', 5 | description='c_ext02 pointer', 6 | author='Jun Koda', 7 | url='https://github.com/junkoda/python_c_ext', 8 | ext_modules=[ 9 | Extension('cext02', ['cext02.cpp']) 10 | ] 11 | ) 12 | 13 | 14 | -------------------------------------------------------------------------------- /03_filename/Makefile: -------------------------------------------------------------------------------- 1 | 2 | all: build 3 | 4 | SRC := cext03.c 5 | 6 | build: $(SRC) 7 | python3 setup.py build_ext --inplace 8 | -------------------------------------------------------------------------------- /03_filename/cext03.c: -------------------------------------------------------------------------------- 1 | // 2 | // Pass filename to C extention 3 | // 4 | 5 | #include 6 | #include "Python.h" 7 | 8 | static PyObject* hello_file(PyObject *self, PyObject *args) 9 | { 10 | // py_filename(filename) 11 | // 12 | // Convert Python string to char* filename 13 | // 14 | PyObject* bytes; 15 | 16 | if(!PyArg_ParseTuple(args, "O&", PyUnicode_FSConverter, &bytes)) { 17 | return NULL; 18 | } 19 | 20 | char* filename; 21 | Py_ssize_t len; 22 | PyBytes_AsStringAndSize(bytes, &filename, &len); 23 | 24 | FILE* const fp= fopen(filename, "w"); 25 | 26 | if(fp == NULL) { 27 | PyErr_SetString(PyExc_IOError, "Error: unable to open file"); 28 | return NULL; 29 | } 30 | 31 | fprintf(fp, "Hello World!\n"); 32 | fclose(fp); 33 | 34 | Py_DECREF(bytes); 35 | 36 | Py_RETURN_NONE; 37 | } 38 | 39 | static PyMethodDef methods[] = { 40 | {"hello_file", hello_file, METH_VARARGS, "pass filename to C extention"}, 41 | {NULL, NULL, 0, NULL} 42 | }; 43 | 44 | static struct PyModuleDef module = { 45 | PyModuleDef_HEAD_INIT, 46 | "cext03", // name of this module 47 | "Pass filename to C extension", // Doc String 48 | -1, 49 | methods 50 | }; 51 | 52 | PyMODINIT_FUNC 53 | PyInit_cext03(void) { 54 | return PyModule_Create(&module); 55 | } 56 | 57 | -------------------------------------------------------------------------------- /03_filename/cext03.py: -------------------------------------------------------------------------------- 1 | import cext03 2 | 3 | cext03.hello_file("filename.txt") 4 | 5 | print("filename.txt written") 6 | 7 | 8 | -------------------------------------------------------------------------------- /03_filename/setup.py: -------------------------------------------------------------------------------- 1 | from distutils.core import setup, Extension 2 | 3 | setup(name='cext03', 4 | version='0.0.1', 5 | description='c_ext03 filename', 6 | author='Jun Koda', 7 | url='https://github.com/junkoda/python_c_ext', 8 | ext_modules=[ 9 | Extension('cext03', ['cext03.c']) 10 | ] 11 | ) 12 | 13 | 14 | -------------------------------------------------------------------------------- /04_nparray/Makefile: -------------------------------------------------------------------------------- 1 | all: build 2 | 3 | SRC := cext04.c 4 | 5 | .PHONY: build clean 6 | 7 | build: $(SRC) 8 | python3 setup.py build_ext --inplace 9 | 10 | clean: 11 | rm -rf build 12 | -------------------------------------------------------------------------------- /04_nparray/cext04.c: -------------------------------------------------------------------------------- 1 | // 2 | // Handles numpy array 3 | // 4 | 5 | #include 6 | #include "Python.h" 7 | 8 | #define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION 9 | #include "numpy/arrayobject.h" 10 | 11 | typedef struct { 12 | float x[3], v[3]; 13 | } Particle; 14 | 15 | static PyObject* py_as_nparray(PyObject *self, PyObject *args) 16 | { 17 | // Suppose you have data in C code and want to pass to Python as an array 18 | const int np=10; 19 | Particle* const p= calloc(sizeof(Particle), np); 20 | // This memory is assumed to be freed by the C code 21 | // (Memory leak in this example) 22 | 23 | int nd=2; 24 | int ncol= sizeof(Particle)/sizeof(float); 25 | npy_intp dims[]= {np, ncol}; 26 | 27 | return PyArray_SimpleNewFromData(nd, dims, NPY_FLOAT, p); 28 | } 29 | 30 | static PyObject* py_read_2darray(PyObject *self, PyObject *args) 31 | { 32 | // Read 2d array 33 | PyObject *bufobj; 34 | if(!PyArg_ParseTuple(args, "O", &bufobj)) 35 | return NULL; 36 | 37 | Py_buffer view; 38 | if(PyObject_GetBuffer(bufobj, &view, 39 | PyBUF_ANY_CONTIGUOUS | PyBUF_FORMAT) == -1) 40 | return NULL; 41 | 42 | 43 | if(view.ndim != 2) { 44 | PyErr_SetString(PyExc_TypeError, "Expected a 2-dimensional array"); 45 | PyBuffer_Release(&view); 46 | return NULL; 47 | } 48 | 49 | if(strcmp(view.format,"d") != 0) { 50 | PyErr_SetString(PyExc_TypeError, "Expected an array of doubles"); 51 | PyBuffer_Release(&view); 52 | return NULL; 53 | } 54 | 55 | const int nrow= view.shape[0]; 56 | const int ncol= view.shape[1]; 57 | 58 | if(ncol < 2) { 59 | PyErr_SetString(PyExc_TypeError, "Expected at least two columns."); 60 | return NULL; 61 | } 62 | 63 | double* p= (double*) view.buf; 64 | const size_t next_row= view.strides[0]/sizeof(double); 65 | const size_t next_col= view.strides[1]/sizeof(double); 66 | 67 | for(int i=0; i 6 | #include 7 | #include "Python.h" 8 | 9 | using namespace std; 10 | 11 | static void py_vector_free(PyObject *obj); 12 | 13 | static PyObject* py_vector_alloc(PyObject *self, PyObject *args) 14 | { 15 | // Suppose you have a data in vector in C++ 16 | // We want to wrap this object in a Python class 17 | vector* const v= new vector(); 18 | 19 | v->push_back(1.0); 20 | v->push_back(2.0); 21 | v->push_back(3.0); 22 | 23 | return PyCapsule_New(v, "_Vector", py_vector_free); 24 | } 25 | 26 | void py_vector_free(PyObject *obj) 27 | { 28 | vector* const v= 29 | (vector*) PyCapsule_GetPointer(obj, "_Vector"); 30 | 31 | delete v; 32 | } 33 | 34 | PyObject* py_vector_len(PyObject *self, PyObject *args) 35 | { 36 | PyObject* py_vector; 37 | if(!PyArg_ParseTuple(args, "O", &py_vector)) 38 | return NULL; 39 | 40 | vector* const v= 41 | (vector*) PyCapsule_GetPointer(py_vector, "_Vector"); 42 | if(!v) return NULL; 43 | 44 | return Py_BuildValue("k", (unsigned long) v->size()); 45 | } 46 | 47 | 48 | PyObject* py_vector_getitem(PyObject *self, PyObject *args) 49 | { 50 | // vector_getitem(_Vector, i) 51 | PyObject* py_vector; 52 | int i; 53 | 54 | if(!PyArg_ParseTuple(args, "Oi", &py_vector, &i)) 55 | return NULL; 56 | 57 | vector* const v= 58 | (vector*) PyCapsule_GetPointer(py_vector, "_Vector"); 59 | if(!v) return NULL; 60 | 61 | double x; 62 | try { 63 | x= v->at(i); 64 | } 65 | catch(const std::out_of_range) { 66 | PyErr_SetNone(PyExc_IndexError); 67 | return NULL; 68 | } 69 | 70 | return Py_BuildValue("d", x); 71 | } 72 | 73 | 74 | static PyMethodDef methods[] = { 75 | {"vector_alloc", py_vector_alloc, METH_VARARGS, "allocate a vector"}, 76 | {"vector_len", py_vector_len, METH_VARARGS, "vector.len()"}, 77 | {"vector_getitem", py_vector_getitem, METH_VARARGS, "vector[i]"}, 78 | {NULL, NULL, 0, NULL} 79 | }; 80 | 81 | static struct PyModuleDef module = { 82 | PyModuleDef_HEAD_INIT, 83 | "cext05", // name of this module 84 | "Use C/C++ vector", // Doc String 85 | -1, 86 | methods 87 | }; 88 | 89 | PyMODINIT_FUNC 90 | PyInit_cext05(void) { 91 | return PyModule_Create(&module); 92 | } 93 | 94 | -------------------------------------------------------------------------------- /05_iterate/setup.py: -------------------------------------------------------------------------------- 1 | from distutils.core import setup, Extension 2 | 3 | setup(name='cext05', 4 | version='0.0.1', 5 | description='c_ext05 iterate', 6 | author='Jun Koda', 7 | url='https://github.com/junkoda/python_c_ext', 8 | ext_modules=[ 9 | Extension('cext05', ['cext05.cpp']) 10 | ] 11 | ) 12 | 13 | 14 | -------------------------------------------------------------------------------- /05_iterate/use_cext05.py: -------------------------------------------------------------------------------- 1 | import cext05 2 | 3 | class Vector: 4 | def __init__(self): 5 | self._v = cext05.vector_alloc() 6 | 7 | def __len__(self): 8 | return cext05.vector_len(self._v) 9 | 10 | def __getitem__(self, i): 11 | return cext05.vector_getitem(self._v, i) 12 | 13 | v = Vector() 14 | 15 | print('len(v) = %d' % len(v)) 16 | 17 | print('for loop') 18 | for x in v: 19 | print(x) 20 | 21 | print('v[1]= %.1f' % v[1]) 22 | 23 | -------------------------------------------------------------------------------- /06_slice/Makefile: -------------------------------------------------------------------------------- 1 | 2 | all: build 3 | 4 | SRC := cext06.cpp 5 | 6 | .PHONY: build clean 7 | 8 | build: $(SRC) 9 | python3 setup.py build_ext --inplace 10 | 11 | clean: 12 | rm -rf *.so build 13 | -------------------------------------------------------------------------------- /06_slice/cext06.cpp: -------------------------------------------------------------------------------- 1 | // 2 | // Handles slicing array[i:j:k] 3 | // 4 | 5 | #include 6 | #include 7 | #include 8 | #include "Python.h" 9 | 10 | using namespace std; 11 | 12 | static const int dat[]= {0,1,2,3,4,5,6,7,8,9}; 13 | static const int n= 10; 14 | 15 | PyObject* py_getitem(PyObject *self, PyObject *args) 16 | { 17 | PyObject* py_index; 18 | if(!PyArg_ParseTuple(args, "O", &py_index)) 19 | return NULL; 20 | 21 | if(PyNumber_Check(py_index)) { 22 | cout << "Number given\n"; 23 | long index= PyLong_AsLong(py_index); 24 | if(PyErr_Occurred()) 25 | return NULL; 26 | 27 | if(index < 0) 28 | index = n - index; 29 | 30 | if(index < 0 || index >= n) { 31 | PyErr_SetNone(PyExc_IndexError); 32 | return NULL; 33 | } 34 | 35 | return Py_BuildValue("i", dat[index]); 36 | } 37 | else if(PySequence_Check(py_index)) { 38 | cout << "Sequience given\n"; 39 | 40 | Py_ssize_t len= PySequence_Length(py_index); 41 | PyObject* const list= PyList_New(len); 42 | 43 | for(Py_ssize_t i=0; i= n) { 50 | PyErr_SetNone(PyExc_IndexError); 51 | return NULL; 52 | } 53 | 54 | PyList_SetItem(list, i, Py_BuildValue("i", dat[index])); 55 | } 56 | return list; 57 | } 58 | else if(PySlice_Check(py_index)) { 59 | cout << "Slice object given\n"; 60 | Py_ssize_t start, stop, step, length; 61 | int ret= PySlice_GetIndicesEx(py_index, n, &start, &stop, &step, &length); 62 | if(ret) 63 | return NULL; 64 | 65 | int len= (stop - start)/step; 66 | printf("len= %d\n", len); 67 | 68 | PyObject* const list= PyList_New(len); 69 | 70 | int index=0; 71 | for(int i=start; i 3 | // 4 | 5 | #include 6 | #include 7 | #include 8 | #include "Python.h" 9 | 10 | #define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION 11 | #include "numpy/arrayobject.h" 12 | 13 | using namespace std; 14 | 15 | struct Particle { 16 | float x[3], v[3]; 17 | }; 18 | 19 | static void py_particles_free(PyObject *obj); 20 | 21 | PyObject* py_particles_alloc(PyObject *self, PyObject *args) 22 | { 23 | // Allocate a new C++ pointer as a Python object "_Particles" 24 | vector* const p= new vector(); 25 | 26 | p->resize(10); 27 | 28 | return PyCapsule_New(p, "_Particles", py_particles_free); 29 | } 30 | 31 | void py_particles_free(PyObject *obj) 32 | { 33 | // Destructor function for _Particles pointer,called automatically from Python 34 | vector* const p= 35 | (vector*) PyCapsule_GetPointer(obj, "_Particles"); 36 | 37 | delete p; 38 | } 39 | 40 | PyObject* py_len(PyObject *self, PyObject *args) 41 | { 42 | PyObject* py_particles; 43 | if(!PyArg_ParseTuple(args, "O", &py_particles)) 44 | return NULL; 45 | 46 | vector* const p= 47 | (vector*) PyCapsule_GetPointer(py_particles, "_Particles"); 48 | if(!p) 49 | return NULL; 50 | 51 | return Py_BuildValue("k", (unsigned long) p->size()); 52 | } 53 | 54 | PyObject* py_as_array(PyObject *self, PyObject *args) 55 | { 56 | PyObject* py_particles; 57 | if(!PyArg_ParseTuple(args, "O", &py_particles)) 58 | return NULL; 59 | 60 | vector* const p= 61 | (vector*) PyCapsule_GetPointer(py_particles, "_Particles"); 62 | if(!p) return NULL; 63 | 64 | int nd=2; 65 | int ncol= sizeof(Particle)/sizeof(float); 66 | npy_intp dims[]= {(npy_intp) p->size(), ncol}; 67 | 68 | return PyArray_SimpleNewFromData(nd, dims, NPY_FLOAT, &(p->front())); 69 | } 70 | 71 | 72 | static PyMethodDef methods[] = { 73 | {"_particles_alloc", py_particles_alloc, METH_VARARGS, "new Particles"}, 74 | {"_as_array", py_as_array, METH_VARARGS, "vector as an array"}, 75 | {"_len", py_len, METH_VARARGS, "vector.size"}, 76 | {NULL, NULL, 0, NULL} 77 | }; 78 | 79 | static struct PyModuleDef module = { 80 | PyModuleDef_HEAD_INIT, 81 | "cext07", // name of this module 82 | "Use vector", // Doc String 83 | -1, 84 | methods 85 | }; 86 | 87 | PyMODINIT_FUNC 88 | PyInit_cext07(void) { 89 | import_array(); 90 | return PyModule_Create(&module); 91 | } 92 | 93 | -------------------------------------------------------------------------------- /07_container/setup.py: -------------------------------------------------------------------------------- 1 | import numpy as np 2 | from distutils.core import setup, Extension 3 | 4 | setup(name='cext07', 5 | version='0.0.1', 6 | description='c_ext08 container', 7 | author='Jun Koda', 8 | url='https://github.com/junkoda/python_c_ext', 9 | ext_modules=[ 10 | Extension('cext07', ['cext07.cpp'], 11 | include_dirs = [np.get_include()]), 12 | ] 13 | ) 14 | 15 | 16 | -------------------------------------------------------------------------------- /07_container/use_cext07.py: -------------------------------------------------------------------------------- 1 | import numpy as np 2 | import cext07 3 | 4 | class Particles: 5 | def __init__(self): 6 | self._p= cext07._particles_alloc() 7 | 8 | def __len__(self): 9 | return cext07._len(self._p) 10 | 11 | def __repr__(self): 12 | return cext07._as_array(self._p).__repr__() 13 | 14 | def __getitem__(self, index): 15 | return cext07._as_array(self._p)[index] 16 | 17 | def asarray(self): 18 | return cext07._as_array(self._p) 19 | 20 | 21 | p = Particles() 22 | 23 | print(p) 24 | print(p[2:5, 1]) 25 | -------------------------------------------------------------------------------- /08_nparray_stride/Makefile: -------------------------------------------------------------------------------- 1 | all: build 2 | 3 | SRC := cext08.c 4 | 5 | .PHONY: build clean 6 | 7 | build: $(SRC) 8 | python3 setup.py build_ext --inplace 9 | 10 | clean: 11 | rm -rf build 12 | -------------------------------------------------------------------------------- /08_nparray_stride/cext08.c: -------------------------------------------------------------------------------- 1 | // 2 | // Handles numpy array 3 | // 4 | 5 | #include 6 | #include "Python.h" 7 | 8 | #define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION 9 | #include "numpy/arrayobject.h" 10 | 11 | typedef struct { 12 | float x[3], v[3]; 13 | } Particle; 14 | 15 | static PyObject* py_as_nparray(PyObject *self, PyObject *args) 16 | { 17 | // Suppose you have data in C code and want to pass to Python as an array 18 | const int np=10; 19 | Particle* const p= calloc(sizeof(Particle), np); 20 | 21 | for(int i=0; ix, 0, 0, 0); 34 | } 35 | 36 | static PyMethodDef methods[] = { 37 | {"as_nparray", py_as_nparray, METH_VARARGS, "return a new np.array"}, 38 | {NULL, NULL, 0, NULL} 39 | }; 40 | 41 | static struct PyModuleDef module = { 42 | PyModuleDef_HEAD_INIT, 43 | "cext08", // name of this module 44 | "Use np.array with stride", // Doc String 45 | -1, 46 | methods 47 | }; 48 | 49 | PyMODINIT_FUNC 50 | PyInit_cext08(void) { 51 | import_array(); 52 | return PyModule_Create(&module); 53 | } 54 | -------------------------------------------------------------------------------- /08_nparray_stride/setup.py: -------------------------------------------------------------------------------- 1 | import numpy as np 2 | from distutils.core import setup, Extension 3 | 4 | setup(name='cext08', 5 | version='0.0.1', 6 | description='c_ext08 return np.array with stride', 7 | author='Jun Koda', 8 | url='https://github.com/junkoda/python_c_ext', 9 | ext_modules=[ 10 | Extension('cext08', ['cext08.c'], 11 | include_dirs = [np.get_include()]), 12 | ], 13 | ) 14 | 15 | 16 | -------------------------------------------------------------------------------- /08_nparray_stride/use_cext08.py: -------------------------------------------------------------------------------- 1 | import numpy as np 2 | import cext08 3 | 4 | print('A new array from C extention') 5 | a = cext08.as_nparray() 6 | print(a) 7 | 8 | -------------------------------------------------------------------------------- /09_sigint/Makefile: -------------------------------------------------------------------------------- 1 | 2 | all: build 3 | 4 | SRC := cext09.c 5 | 6 | build: $(SRC) 7 | python3 setup.py build_ext --inplace 8 | -------------------------------------------------------------------------------- /09_sigint/cext09.c: -------------------------------------------------------------------------------- 1 | // 2 | // How to stop Python C-extension with Ctrl+C 3 | // 4 | #include 5 | #include 6 | #include "Python.h" 7 | 8 | void sigint_handler(int signo) { 9 | printf("recieved SIGINT"); 10 | abort(); 11 | } 12 | 13 | static PyObject* long_computation(PyObject *self, PyObject *args) 14 | { 15 | const size_t n= 1L << 30; 16 | 17 | printf("Sum of 1/1 + 1/2 + ... + 1/%lu = ... ", n); fflush(stdout); 18 | 19 | double sum_inv= 0; 20 | 21 | Py_BEGIN_ALLOW_THREADS 22 | for(size_t i=1; i<=n; ++i) 23 | sum_inv += 1.0/i; 24 | Py_END_ALLOW_THREADS 25 | 26 | printf(" = %lf\n", sum_inv); 27 | 28 | Py_RETURN_NONE; 29 | } 30 | 31 | static PyMethodDef methods[] = { 32 | {"long_computation", long_computation, METH_VARARGS, "A long computation"}, 33 | {NULL, NULL, 0, NULL} 34 | }; 35 | 36 | static struct PyModuleDef module = { 37 | PyModuleDef_HEAD_INIT, 38 | "cext09", // name of this module 39 | "Handles ctrl+c", // Doc String 40 | -1, 41 | methods 42 | }; 43 | 44 | PyMODINIT_FUNC 45 | PyInit_cext09(void) { 46 | //signal(SIGINT, sigint_handler); 47 | return PyModule_Create(&module); 48 | } 49 | -------------------------------------------------------------------------------- /09_sigint/cext09.py: -------------------------------------------------------------------------------- 1 | import signal 2 | import sys 3 | import cext09 4 | 5 | import signal 6 | signal.signal(signal.SIGINT, signal.SIG_DFL) 7 | 8 | cext09.long_computation() 9 | -------------------------------------------------------------------------------- /09_sigint/setup.py: -------------------------------------------------------------------------------- 1 | from distutils.core import setup, Extension 2 | 3 | setup(name='cext09', 4 | version='0.0.1', 5 | description='c_ext09 sigint handler', 6 | author='Jun Koda', 7 | url='https://github.com/junkoda/python_c_ext', 8 | ext_modules=[ 9 | Extension('cext09', ['cext09.c']) 10 | ] 11 | ) 12 | 13 | 14 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | python_c_ext 2 | ============ 3 | 4 | Simple examples for extending Python with C/C++ 5 | 6 | ## Build 7 | 8 | Compile the extension module: 9 | 10 | ```bash 11 | $ cd 01_hello_world 12 | $ python3 setup.py build_ext --inplace 13 | ``` 14 | 15 | This can be done by `make`, too: 16 | 17 | ```bash 18 | $ make 19 | ``` 20 | 21 | Run a python script using the extension: 22 | 23 | ```bash 24 | $ python3 ext01.py 25 | ``` 26 | 27 | ## 01_hello_world 28 | 29 | A minimum extension module. 30 | 31 | ## 02_pointer 32 | 33 | Use C/C++ pointer from Python. 34 | 35 | ## 03_filename 36 | 37 | Pass a filename string from Python to C/C++. 38 | 39 | ## 04_nparray 40 | 41 | Return C/C++ data as an np.array. 42 | 43 | ## 08_nparray_stride 44 | 45 | Return a part of C/C++ data as an np.array. 46 | 47 | ## 09_sigint 48 | 49 | Stop Python during long computation with Ctrl-C. --------------------------------------------------------------------------------