How to update python3 linux

How to Update Python

Python receives a major update once every 12 months, with bug-fix updates and security patches being released every few months. The most recent version of Python – Python 3.9 – introduces features like Union Operators in dict, the Flexible function, and Type Hinting Generics. Updating Python can be confusing regardless of which OS you’re running. Do you remove the old version first? Or can you update the package directly? Here’s an easy tutorial on how to update Python.

How to Update Python in Linux, Mac, or Windows

It is possible to install two major versions of Python – say, Python 2.x and Python 3.x – on one computer and use both. If you want to move from Python 2.x to 3.x, you don’t have to uninstall the previous version unless you don’t want to use it anymore. Furthermore, Python 3 now comes with the “py.exe” launcher integrated by default. The launcher helps users in two ways:

1. Users can run Python from any shell using the command “py.” Typing “python” is no longer required.
2. Allows you to use two different versions of Python 3 at the same time. You can specify which version of Python you want to use to run code with simple switches in commands (like “py -3.6”).

In other words, you won’t need to change the PATH variable every time you want to use another version of Python. But the launcher only comes installed on the Windows version of Python 3. Updating Python in computers with Linux or macOS can be more complicated.

Note: If you’ve not installed Python on your computer yet, you cannot update to a newer version. If you’re having trouble installing Python on your computer, reading our Python installation guide will help.

Updating Python in Linux

Before you run any commands, you can save yourself a lot of effort by checking whether the Linux installation comes with the latest version of Python installed. To check what version of Python 3 your machine has, open the Terminal by pressing Ctrl+Alt +T, and type in the following command: python3 –version Or alternatively: python3 -V The output should look something like this: If you see that your machine doesn’t have Python 3.9, you must run the following commands: sudo apt update sudo apt install software-properties-common These commands will install the Python packages required to install the newest Python version. You can now install the latest version of Python in two ways: using Apt and using the source code. Using Apt to update Python is faster and easier. Here’s how you do it:

Updating Python Using Apt-Get

Using the Apt package manager is the easiest method of installing Python 3.9 on Linux. First, you must configure the deadsnakes PPA to your machine by running the following command: sudo add-apt-repository ppa:deadsnakes/ppa You can now update the apt cache and install the Python 3.9 package: sudo apt update sudo apt install python3.9 The Python update will install. However, by default, Python will point to the previously installed version of Python 3. After installation completes, you must update Python 3 to point to Python 3.9. Enter this command to configure Python 3: sudo update-alternatives —config python3 A list of options will appear, and you will be prompted to pick which version of Python you want Python 3 to point to. The prompt should look like this: All you have to do is type the right selection number, and you will have updated Python to the newest version on your Linux machine. To verify the version of Python being used, you can run: python3 —V

Updating Python in Mac

Updating Python on a machine with macOS is a lot easier than updating it on a Linux machine. A Mac can have more than one version of Python installed. Therefore, you can update Python by visiting https://www.python.org/downloads/mac-osx/ , downloading the installer, and running it. If you have Homebrew installed on your Mac, you can run the following command on the Terminal: brew install python After the process completes, your computer will have the latest version of Python 3. You can verify this by running the command: python3 —version If you want to upgrade pip and add a new library to it, you can enter the following command: pip3 install

Updating Python in Windows

Updating to a new Python version is easy on a computer running Windows. All you have to do is visit the Python downloads page and download the latest version. If you’re updating to a new patch of Python (3.x.a to 3.x.b), when you run the installer, it will prompt you to “Upgrade Now.” The installer will look like this: Clicking on the button will replace the existing version of Python with the new version. The older version will be removed from your computer. After you restart the computer, the new patch will be installed on your machine. In contrast, if you’re updating Python to a new minor version (3.x to 3.y), you will see the “Install Now” prompt instead of the “Upgrade Now” prompt on the installer. Clicking the button will install the new version of Python. However, the old version will not be removed. Your computer can have more than one Python version installed. The py launcher is installed automatically regardless of the version of Python you’re using. It will enable you to select the version of Python you want to use. Running a program with a specific version is as simple as using the “py” command and entering the version you want to use, like so: py -3.8 or py -3.9 Suppose there are many projects on your machine that use the previous version of Python, and you use them all in a virtual environment. In that case, you can update Python just in that environment using the following command: python -m venv —upgrade

Conclusion

Every version of Python, including the newest release , has some limitations. However, updating to the latest version of Python allows you to use all the new features. Furthermore, updated versions also come with bug fixes and improved security measures. With this guide handy, you should be able to get your hands on the newest Python version in a matter of minutes. Going through our Python usage guide next will help you quickly pick up all that you can do with Python.

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Как обновить python на Ubuntu

Admin 30.10.2022 Linux, Python, Ubuntu

Обновление на новые версии это всегда «весело». Вместе с новым функционалом понадобится убрать устаревшие функции, обновить потерявшие совместимость модули и в целом проделать большую работу.

Подготавливаем данные с локальной версии

Сначала обновляем версию локально, тестируем. Фиксируем изменения всех зависимостей командой:

Обновляем Ubuntu на сервере

Обновим систему и пакеты в ней:

Обновляем python на сервере

Если сразу запустить обновление, то возникнет ошибка:

sudo apt install python3.10
Чтение списков пакетов… Готово
Построение дерева зависимостей
Чтение информации о состоянии… Готово
E: Невозможно найти пакет python3.10
E: Не удалось найти ни один пакет с помощью шаблона «python3.10»

Сначала установим необходимые компоненты для добавления пользовательских PPA:

Добавим PPA-репозиторий deadsnakes/ppa в список источников диспетчера пакетов APT:

Запустим обновление APT для обновления менеджера пакетов — появится новый импортированный PPA:

Теперь можем установить новую версию python 3.10:

Проверим установленную версию:

Также проверим текущую версию по умолчанию:

Установим дополнительные модули стандартной библиотеки (venv):

Также могут пригодиться и другие модули:

sudo apt install python3.10-distutils -y
sudo apt install python3.10-lib2to3 -y
sudo apt install python3.10-gdbm -y
sudo apt install python3.10-tk -y

Многие дополнительные модули python нужны для работы библиотек, без них они не установятся и будут вылезать ошибки.

Меняем версию python в системе «по умолчанию»

По умолчанию python будет указывать на старую версию.

Например, Python 3 указывает на Python 3.8. Это значит, что когда мы запустим python3, он будет выполняться как python 3.8, мы же хотим выполнить его как python 3.10.

Для этого добавим альтернативы:

sudo update-alternatives —install /usr/bin/python3 python3 /usr/bin/python3.8 1
sudo update-alternatives —install /usr/bin/python3 python3 /usr/bin/python3.10 2

Устанавливаем новое окружение

Переименовываем старую директорию окружения (мы должны находится в директории сайта с виртуальным окружением):

Затем в этой директории создаем новое виртуальное окружение:

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How to update python to latest version and set as default

I am currently on ubuntu 18.04. My default python version is Python 3.7.9 I wanted to upgrade it to Python 3.9.2 and set it as default python version How do I do that ?

if you don’t have it in apt then you can add special repo for Ubuntu deadsnakes Python repo for Ubuntu . And after adding repo you should have all versions in apt

2 Answers 2

Install Python normally with the deadsnake PPA:

sudo add-apt-repository ppa:deadsnakes/ppa sudo apt update sudo apt install python3.9 

Check if you can access Python:

If so, create a symlink to set it as «default»:

sudo mv /usr/bin/python /usr/bin/python3.7 sudo ln -s $(which python3.9) /usr/bin/python 

This is the error I am getting E: Unable to locate package python3.9 E: Couldn’t find any package by glob ‘python3.9’

If you don’t have it in apt then you can add special repo deadsnakes Python repo for Ubuntu.
And after adding repo you should have all versions in apt form 2.3 to 3.10

sudo add-apt-repository ppa:deadsnakes/ppa sudo apt-get update sudo apt install python3.9 

And later you can find path to actuall version

and replace is with python3.9 which you can also find with

But sometimes it is not good idea to replace it because system may need older version and it will not work with newer one. I prefer to use python3.9 when I need 3.9 and python3.7 when I really need 3.7 .

After adding this repo it will also inform you when there will be newer version 3.9.x

This repo works also in Linux Mint which is based on Ubuntu.

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