Installing Python 3 on Linux

This document describes how to install Python 3.6 on Ubuntu Linux machines.

To see which version of Python 3 you have installed, open a command prompt and run

$ python3 --version

If you are using Ubuntu 16.10 or newer, then you can easily install Python 3.6 with the following commands:

$ sudo apt-get update
$ sudo apt-get install python3.6

If you’re using another version of Ubuntu (e.g. the latest LTS release), we recommend using the deadsnakes PPA to install Python 3.6:

$ sudo apt-get install software-properties-common
$ sudo add-apt-repository ppa:deadsnakes/ppa
$ sudo apt-get update
$ sudo apt-get install python3.6

If you are using other Linux distribution, chances are you already have Python 3pre-installed as well. If not, use your distribution’s package manager.For example on Fedora, you would use dnf:

$ sudo dnf install python3

Note that if the version of the python3 package is not recent enoughfor you, there may be ways of installing more recent versions as well,depending on you distribution. For example installing the python36 packageon Fedora 25 to get Python 3.6. If you are a Fedora user, you might wantto read about multiple Python versions available in Fedora.

Working with Python 3

At this point, you may have system Python 2.7 available as well.

$ python

This will launch the Python 2 interpreter.

$ python3

This will launch the Python 3 interpreter.

Setuptools & Pip

The two most crucial third-party Python packages are setuptools and pip.

Once installed, you can download, install and uninstall any compliant Python softwareproduct with a single command. It also enables you to add this network installationcapability to your own Python software with very little work.

Python 2.7.9 and later (on the python2 series), and Python 3.4 and later includepip by default.

To see if pip is installed, open a command prompt and run

$ command -v pip

To install pip, follow the official pip installation guide - this will automatically install the latest version of setuptools.

Note that on some Linux distributions including Ubuntu and Fedora the pipcommand is meant for Python 2, while the pip3 command is meant for Python 3.

$ command -v pip3

However, when using virtual environments (described below), you don’t need tocare about that.

Pipenv & Virtual Environments

The next step is to install Pipenv, so you can install dependencies and manage virtual environments.

A Virtual Environment is a tool to keep the dependencies required by different projectsin separate places, by creating virtual Python environments for them. It solves the“Project X depends on version 1.x but, Project Y needs 4.x” dilemma, and keepsyour global site-packages directory clean and manageable.

For example, you can work on a project which requires Django 1.10 while alsomaintaining a project which requires Django 1.8.

So, onward! To the Pipenv & Virtual Environments docs!

This page is a remixed version of another guide,which is available under the same license.

原文: https://docs.python-guide.org/starting/install3/linux/