Python simple skills and common references_PHP tutorial
Python simple tips and common references
python files support Chinese
# -*- coding: UTF-8 -*-
Execute shell command
from subprocess import Popen, PIPE
def run_cmd(cmd):
#Popen call wrapper.return (code, stdout, stderr)
child = Popen(cmd, stdin = PIPE, stdout = PIPE, stderr = PIPE, shell = True)
Out, err = child.communicate()
ret = child.wait()
Return (ret, out, err)
Get the path of the current python script file
import os
os.path.split(os.path.realpath(__file__))[0]
Problems with json module import
try :
Import json
except :
Import simplejson as json
Use json tool to format json
#python 2.7 or below
echo \'{\"hello\":1}\' | python -m simplejson.tool
#python 2.7 and above
echo \'{\"hello\":1}\' | python -m json.tool
General calling steps
Py_Initialize(); //Initialize the Python environment
PyImport_ImportModule("test"); // Load python module
PyObject_GetAttrString(g_pModule,"test1"); //Get the PyObject
of the corresponding Python function
PyObject_CallFunction(test1,"i,s",2,e); //Call the corresponding function in Python
Py_Finalize(); //End
Sample code in C language
#include
int main(){
PyObject * g_pModule = NULL;
Py_Initialize(); //Before using python, you need to call Py_Initialize(); this function is initialized
If (!Py_IsInitialized())
{
printf("init error\n");
return -1;
}
PyRun_SimpleString("import sys");
PyRun_SimpleString("sys.path.append('./')");
g_pModule =PyImport_ImportModule("mytest");//This is the file name to be called, here is test.py
in the current directory
If (!g_pModule) {
printf("Cant open python file!\n");
Return -2;
}
PyObject * test1 = PyObject_GetAttrString(g_pModule,"test1"); //Here is the function name to be called
PyObject *objResult = PyObject_CallFunction(test1,"i,s",2,e);//Call function
if (!objResult){
printf("invoke function fail\n");
}
PyObject * test2= PyObject_GetAttrString(g_pModule,"test2"); //Here is the function name to be called
objResult = PyObject_CallFunction(test2,"i",2);//Call function
char * x = PyString_AsString(objResult);
printf("%s\n",x);
Py_Finalize();//Call Py_Finalize, which corresponds to Py_Initialize.
}
Python program mytest.py
def test1(s,str):
Print s+str
Return 0
def test2(s):
Return s
Compilation method of C program
# Assuming that our python is installed in /opt/python when compiling, then we can use such a command to compile the program
$gcc -I/opt/python/include -L/opt/python/lib/ -lpython2.7 test.c
Note: When compiling python, you need to have a dynamic link library and add --enable-shared
./configure --prefix=/opt/python --enable-shared

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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