Installing Python 3.9 on Linux: Detailed Steps and Notes

Here is a shared tutorial for installing Python 3.9:

Python is a popular programming language that is widely used in web development, data science, artificial intelligence, etc. The latest version of Python is 3.9, and this article will explain how to install Python 3.9 on your Linux system.

Steps:

1. Updating the system package list

Open a terminal and use the following command to update the system package list:

sqlCopy codesudo apt update

2. Installation of required dependencies

Use the following commands to install the required dependencies for compiling and installing Python:

Copy codesudo apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev wget

3. Download Python 3.9 Source Code

Use the following command to download the Python 3.9 source code from the official Python website:

rubyCopy codewget https://www.python.org/ftp/python/3.9.0/Python-3.9.0.tgz

4. Unzip the source code

Use the following command to unzip the downloaded source code:

Copy codetar -xf Python-3.9.0.tgz

5. Configuring Python 3.9

Go to the extracted directory and configure it with the following command:

bashCopy codecd Python-3.9.0
. /configure --enable-optimizations

6. Compiling Python 3.9

Compile Python 3.9 using the following command:

goCopy codemake -j 8

Here "-j 8" means use 8 threads to speed up the compilation. You can adjust it according to your system configuration.

7. Installing Python 3.9

Use the following command to install Python 3.9 on your system:

goCopy codesudo make altinstall

Note that the "altinstall" option is used instead of the "install" option to avoid setting Python 3.9 as the system default.

8. Checking Python 3.9

Use the following command to check if Python 3.9 has been successfully installed:

cssCopy codepython3.9 --version

If the version number of Python 3.9 is output, the installation was successful.

Summary:

To install Python 3.9, you need to update the system package list and install the required dependencies, then download the source code and unzip it, configure, compile and install Python 3.9, and finally use the "python3.9" command to check whether Python 3.9 has been successfully installed. During the installation process, you should pay attention to the correct use of options and commands to avoid problems or errors.