{"id":10327,"date":"2021-09-28T09:44:41","date_gmt":"2021-09-28T09:44:41","guid":{"rendered":"https:\/\/linuxways.net\/?p=10327"},"modified":"2021-09-28T09:44:41","modified_gmt":"2021-09-28T09:44:41","slug":"how-to-install-python-3-9-on-debian-11","status":"publish","type":"post","link":"https:\/\/linuxways.net\/de\/debian\/how-to-install-python-3-9-on-debian-11\/","title":{"rendered":"How to Install Python 3.9 on Debian 11"},"content":{"rendered":"

Python is arguably one of the most popular and versatile programming languages. It\u2019s a multi-purpose language and provides a myriad of use cases such as the development of full stack web apps, artificial intelligence, web scraping, and visualization of data in cool dashboards in data science.<\/p>\n

Currently, Python 3.9.7<\/a> is the latest version of Python and provides quite a number of benefits including flexible variable and function notations, union operators in dict, support for IANA timezone and so many others<\/a>.<\/p>\n

In this guide, we will walk you through the installation of Python 3.9 on Debian 11.<\/p>\n

Step 1: Install Python3 dependencies<\/strong><\/h2>\n

This walkthrough will require us to compile Python from source. This allows us to install the latest version of Python and further customize build options.<\/p>\n

To get started, update the package index.<\/p>\n

$ sudo apt update<\/strong><\/pre>\n
Next, install the dependencies and libraries required to build Python.<\/p>\n
$ sudo apt install build-essential libncurses5-dev zlib1g-dev libnss3-dev libgdbm-dev libssl-dev libsqlite3-dev libffi-dev libreadline-dev curl libbz2-dev<\/strong><\/pre>\n
This installs a host of additional packages and other dependencies.<\/p>\n
<\/strong><\/p>\n
Once the installation of Python dependencies is complete, the next step will be to download the latest Python 3.9 installation file.<\/p>\n
Step 2: Download and install the latest Python 3.9<\/strong><\/h2>\n
Next, we will download the gzipped source code file from the Official Python release and download page as shown.<\/p>\n
So, to download the tarball file, run the command:<\/p>\n
$ sudo wget https:\/\/www.python.org\/ftp\/python\/3.9.7\/Python-3.9.7.tgz<\/strong><\/pre>\n
<\/p>\n
Next, extract the compressed file as follows.<\/p>\n
$ tar -xvf Python-3.9.1.tgz<\/strong><\/pre>\n
After the extraction, you will now have 2 files: the tarball file and the decompressed folder ( Python-3.9.7)<\/p>\n
<\/p>\n
To compile Python from source navigate to the uncompressed folder.<\/p>\n
$ cd Python-3.9.1<\/strong><\/pre>\n
Then run the configure script as shown.<\/p>\n
$ \/configure --enable-optimizations<\/strong><\/pre>\n
This runs multiple tests and takes quite some time. In my case, this took approximately 30 minutes. Here is some sample output.<\/p>\n
<\/p>\n
Then commence the build process.<\/p>\n
$ make -j 2<\/strong><\/pre>\n
The -j <\/strong>option specifies the number of CPU cores. You can check out the number of cores on your Linux system by executing the nproc<\/strong> command.<\/p>\n
$ nproc<\/strong><\/pre>\n
<\/strong><\/p>\n
Here\u2019s some sample output of the build process.<\/p>\n
<\/strong><\/p>\n
Afterward, run the following command to install Python binaries.<\/p>\n
$ sudo make altinstall<\/strong><\/pre>\n
This finalizes the installation of Python 3.9.7 on your system.<\/p>\n
Step 3: Testing the installation<\/strong><\/h2>\n
You can confirm the version of Python installed using the command:<\/p>\n
$ python3.9 --version<\/strong><\/pre>\n
<\/p>\n
You can access Python 3.9 shell using the command<\/p>\n
$ python3.9<\/strong><\/pre>\n
<\/strong><\/p>\n
To give it a test run, we will write a simple program to find the sum of two variables, x and y.<\/p>\n
x = 35<\/strong>\r\n\r\ny = 75<\/strong>\r\n\r\nz = x + y<\/strong>\r\n\r\nprint(\"Hello, the sum of x and y is\", +z)<\/strong><\/pre>\n
Output<\/strong><\/p>\n
Hello, the sum of x and y is 110<\/strong><\/p>\n
And there we go! Python 3.9.7 is now installed on Debian 11.<\/p>","protected":false},"excerpt":{"rendered":"
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