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What is the best way to program in Python? Understand the hottest Python CGI programming at the moment

Tomorin

Aug 16, 2018 pm 01:51 PM

In the previous article"What can python do? Python Practical Application Scenario Analysis》, briefly introduces the role and benefits of Python programming. With the extension of knowledge points, let’s briefly introduce what Python CGI is. programming.

If you want to understand what Python CGI programming is, you must first know what CGI

CGI is currently used by NCSA Maintenance, NCSA defines CGI as follows:

CGI (Common Gateway Interface), common gateway interface, is a program that runs on a server such as an HTTP server and provides an interface with the client HTML page.

Web browsing

In order to better understand how CGI works, we can start with the process of clicking a link or URL on a web page:

1. Use your browser to access the URL and connect to the HTTP web server.

2. After receiving the request information, the web server will parse the URL and check whether the accessed file exists on the server. If the file exists, it will return the content of the file, otherwise it will return an error message.

3. The browser receives information from the server and displays the received file or error message.

CGI programs can be Python scripts, PERL scripts, SHELL scripts, C or C programs, etc.

CGI Architecture Diagram

What is the best way to program in Python? Understand the hottest Python CGI programming at the moment

##The first Python CGI programming

We use Python to create the first CGI programming, the file name is hello.py, and the file is located in /var/www/cgi -bin directory, the content is as follows:

#!/usr/bin/python
# -*- coding: UTF-8 -*-
print "Content-type:text/html"
print                     # 空行，告诉服务器结束头部
print &#39;<html>&#39;
print &#39;<head>&#39;
print &#39;<meta charset="utf-8">&#39;
print &#39;<title>Hello World - 我的第一个 CGI 程序！</title>&#39;
print &#39;</head>&#39;
print &#39;<body>&#39;
print &#39;<h2 id="Hello-nbsp-World-nbsp-我是来自php中文网的第一CGI程序">Hello World! 我是来自php中文网的第一CGI程序</h2>&#39;
print &#39;</body>&#39;
print &#39;</html>&#39;

After saving the file, modify hello.py and modify the file permissions to 755:

chmod 755 hello.py

The above program is accessed in the browser http://localhost/cgi-bin/hello.py and the result is as follows:

Hello World! 我是来自php中文网的第一CGI程序

This hello.py script is a simple Python script. The output content of the first line of the script "Content-type: text/html" is sent to the browser and tells the browser that the displayed content type is "text/html".

Use print to output a blank line to tell the server to end the header information.

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