C 擴充套件python ,簡單例子,實現加法

首先編寫lgadd_model.cpp

#define py_ssize_t_clean
#include "python.h"
/*由於 python 可能會定義一些能在某些系統上影響標準標頭檔案的預處理器定義，
因此在包含任何標準標頭檔案之前，你 必須 先包含 python.h。
*/// c++ 實現加法,傳入倆個int型,輸出和.
int add(int a, int b);
/*模組中每個可供python呼叫的函式都需要乙個對應的包裹函式*/
static pyobject *lg_add(pyobject * self, pyobject *args)
return (pyobject*)py_buildvalue("i",add(a,b));
/* 這裡返回的值,必須這麼寫,返回的是乙個python物件,而不能直接是c物件.*/
};// 定義乙個方法表,方法表中可以包含多個方法
static pymethoddef lgmethods = ,
/* sentinel */
};// 定義模組結構 引用方法表
static struct pymoduledef lgmodule = ;
/*模組初始化函式必須命名為pyinit_name(),其中name是模組的名字,並應該定義為非static.
模組結構必須傳遞給直譯器的模組初始化函式*/
pymodinit_func
pyinit_lg(void)
/*需要特別注意 檔案各方法名稱的對應關係,必須完全對應*/

編寫 setup.py檔案

from distutils.core import setup,extension
mod = 'lg' # 模組名
setup(name=mod,ext_modules=[extension(mod,sources=['lgadd_model.cpp'])])

執行進行編譯

python setup.py build

輸出:

running build running build_ext building 'lg' extension gcc -pthread -b /home/***/anaconda3/compiler_compat -wl,--sysroot=/ -wsign-compare -dndebug -g -fwrapv -o3 -wall -wstrict-prototypes -fpic -i/home/***/anaconda3/include/python3.7m -c cal_ids.cpp -o build/temp.linux-x86_64-3.7/cal_ids.o cc1plus: warning: command line option 『-wstrict-prototypes』 is valid for c/objc but not for c++ creating build/lib.linux-x86_64-3.7

g++ -pthread -shared -b /home/***/anaconda3/compiler_compat -l/home/***/anaconda3/lib -wl,-rpath=/home/***/anaconda3/lib -wl,--no-as-needed -wl,--sysroot=/ build/temp.linux-x86_64-3.7/cal_ids.o -o build/lib.linux-x86_64-3.7/lg.cpython-37m-x86_64-linux-gnu.so

執行進行安裝

python setup.py install

輸出:

running install running bdist_egg running egg_info creating lg.egg-info writing lg.egg-info/pkg-info writing dependency_links to lg.egg-info/dependency_links.txt writing top-level names to lg.egg-info/top_level.txt writing manifest file 'lg.egg-info/sources.txt' reading manifest file 'lg.egg-info/sources.txt' writing manifest file 'lg.egg-info/sources.txt' installing library code to build/bdist.linux-x86_64/egg running install_lib running build_ext creating build/bdist.linux-x86_64 creating build/bdist.linux-x86_64/egg copying build/lib.linux-x86_64-3.7/lg.cpython-37m-x86_64-linux-gnu.so -> build/bdist.linux-x86_64/egg creating stub loader for lg.cpython-37m-x86_64-linux-gnu.so byte-compiling build/bdist.linux-x86_64/egg/lg.py to lg.cpython-37.pyc creating build/bdist.linux-x86_64/egg/egg-info copying lg.egg-info/pkg-info -> build/bdist.linux-x86_64/egg/egg-info copying lg.egg-info/sources.txt -> build/bdist.linux-x86_64/egg/egg-info copying lg.egg-info/dependency_links.txt -> build/bdist.linux-x86_64/egg/egg-info copying lg.egg-info/top_level.txt -> build/bdist.linux-x86_64/egg/egg-info writing build/bdist.linux-x86_64/egg/egg-info/native_libs.txt zip_safe flag not set; analyzing archive contents... __pycache__.lg.cpython-37: module references __file__ creating dist creating 'dist/lg-0.0.0-py3.7-linux-x86_64.egg' and adding 'build/bdist.linux-x86_64/egg' to it removing 'build/bdist.linux-x86_64/egg' (and everything under it) processing lg-0.0.0-py3.7-linux-x86_64.egg creating /home/***/anaconda3/lib/python3.7/site-packages/lg-0.0.0-py3.7-linux-x86_64.egg extracting lg-0.0.0-py3.7-linux-x86_64.egg to /home/***/anaconda3/lib/python3.7/site-packages adding lg 0.0.0 to easy-install.pth file installed /home/***/anaconda3/lib/python3.7/site-packages/lg-0.0.0-py3.7-linux-x86_64.egg processing dependencies for lg==0.0.0

finished processing dependencies for lg==0.0.0

最終在python檔案中就可以呼叫

import lg
a = 1
b =2
print(lg.add(a,b))

在呼叫時, 雖然lg模組顯示no module named lg

但是可以正常使用

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