How to create an application using Python and Flask on Linux

Whether you are entertaining or working on linux, this is a great opportunity for you to program using python. Back to college I want them to teach me Python instead of Java, which is interesting to learn and useful in practical applications such as yum package manager. In this tutorial, I will show you how to use python and a micro-framework called flask to build a simple application to display useful information such as memory usage and CPU percentage of each process. Prerequisites: Python basics, lists, classes, functions, and modules. HTMLCSS (basic ). Learning this tutorial... whether you are entertaining or working on linux, this is a great opportunity for you to use python for programming. Back to college I want them to teach me Python instead of Java, which is interesting to learn and useful in practical applications such as yum package manager.

In this tutorial, I will show you how to use python and a micro-framework called flask to build a simple application to display useful information such as memory usage and CPU percentage of each process.

Prerequisites

Python basics, lists, classes, functions, and modules. HTML/CSS (basic ).

To learn this tutorial, you do not have to be a python advanced developer.

Install Python 3 on Linux

Python is installed by default on most Linux distributions. The following command shows the installed version.

[root@linux-vps ~]# python -VPython 2.7.5

We will use version 3.x to build our app. According to Python.org, this version is only improved and is not backward compatible with Python 2.

Note:: Before you start, I strongly recommend that you try this tutorial on a virtual machine, because Python is the core component of many Linux distributions and may damage your system in any way.

The following steps are Red Hat-based versions such as CentOS (6 and 7). Debian-based versions such as tumint and Resbian can skip this step. Pythonn 3 should have been installed by default. If not, use apt-get instead of yum to install the corresponding package.

[Leo @ linux-vps] yum groupinstall 'development tool' [leo @ linux-vps] yum install-y zlib-dev openssl-devel sqlite-devel bzip2-devel [leo @ linux-vps] wget https://www.python.org/ftp/python/3.4.2/Python-3.4.2.tgz[leo@linux-vps] tar-xvzf Python-3.4.2.tgz [leo @ linux-vps] cd Python-3.4.2 [leo @ linux-vps]. /configure [leo @ linux-vps] make # make altinstall is recommended to overwrite the current python library [leo @ linux-vps] make altinstall

After successful installation, you should be able to use the following command to enter the shell of Python3.4.

[leo@linux-vps]# python3.4Python 3.4.2 (default, Dec 12 2014, 08:01:15)[GCC 4.8.2 20140120 (Red Hat 4.8.2-16)] on linuxType "help", "copyright", "credits" or "license" for more information.>>> exit ()

Use pip to install packages

Python has its own package management, similar to yum and apt-get. You will need it to download, install, and uninstall the package.

[leo@linux-vps] pip3.4 install "packagename"    [leo@linux-vps] pip3.4 list[leo@linux-vps] pip3.4 uninstall "packagename"

Python virtual environment

In Python, a virtual environment is a directory where your project depends on the environment. This is a good way to isolate projects with different dependent environments. It allows you to install the installation package without using the sudo command.

[leo@linux-vps] mkdir python3.4-flask[leo@linux-vps] cd python3.4-flask [leo@linux-vps python3.4-flask] pyvenv-3.4 venv

To create a virtual environment, you need to use the pyvenv-3.4 command. The above Command will create a directory named lib inside the venv folder, where the package on which the project depends will be installed. A bin folder will also be created to hold the pip and python executable files in the environment.

Activate the virtual environment for our Linux system Information Project

[leo@linux-vps python3.4-flask] source venv/bin/activate [leo@linux-vps python3.4-flask] which pip3.4~/python3.4-flask/venv/bin/pip3.4[leo@linux-vps python3.4-flask] which python3.4~/python3.4-flask/venv/bin/python3.4

Install flask using pip

Let's continue to install the flask framework of the first module, which can process access routing and render and display the template of our app.

[leo@linux-vps python3.4-flask]pip3.4 install flask

The above describes how to create an application using Python and Flask in Linux. For more information, see other related articles in the first PHP community!