How do I install the latest Python 2.7.X or 3.X on Ubuntu?
First, install some dependencies:
sudo apt-get install build-essential checkinstall
sudo apt-get install libreadline-gplv2-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev
Then download using the following command:
version=2.7.13
cd ~/Downloads/
wget https://www.python.org/ftp/python/$version/Python-$version.tgz
Extract and go to the directory:
tar -xvf Python-$version.tgz
cd Python-$version
Now, install using the command you just tried, using checkinstall instead to make it easier to uninstall if needed:
./configure
make
sudo checkinstall
Change version to whichever version you need (version=2.7.1 or version=3.6.0, for example).
Unless you really have a burning desire to compile it yourself, the preferred way is to use the DeadSnakes PPA to install versions of Python that aren't included by default:
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt-get update
sudo apt-get install python2.7
Other versions, such as python2.4 or python3.6, etc. are also available.
Continuing to document this for the latest Ubuntu releases1 : for Ubuntu 16.04.1 server, the default Python is version 3.5, and Python 2.7 is not installed by default. On a fresh install (note that there's not even a python executable):
$ type python3 python2 python
python3 is /usr/bin/python3
-bash: type: python2: not found
-bash: type: python: not found
$ python3 --version
Python 3.5.2
$ python --version
The program 'python' can be found in the following packages:
* python-minimal
* python3
Try: sudo apt install <selected package>
Note: before continuing, you will probably want to do a quick sudo apt-get update, sudo apt-get upgrade, and sudo apt-get dist-upgrade (please do note exactly what these commands are in fact doing; I'm assuming a fresh install here.)
Installing python 2.7 is as easy as:
$ sudo apt-get install python2.7
The initial output of installing python 2.7 is as follows:
$ sudo apt-get install python2.7
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
libpython2.7-minimal libpython2.7-stdlib python2.7-minimal
Suggested packages:
python2.7-doc binutils binfmt-support
The following NEW packages will be installed:
libpython2.7-minimal libpython2.7-stdlib python2.7 python2.7-minimal
0 upgraded, 4 newly installed, 0 to remove and 0 not upgraded.
Need to get 3,735 kB of archives.
After this operation, 15.8 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
...etc, etc...
After installing python 2.7,
$ type python3 python2.7 python3.5 python2 python
python3 is /usr/bin/python3
python2.7 is /usr/bin/python2.7
python3.5 is /usr/bin/python3.5
bash: type: python2: not found
bash: type: python: not found
But there's still a problem, since you can't yet install PyPI modules via pip -- e.g., if you want jupyter notebook, or the latest scipy or numpy (etc), you'll want to install pip and then pip install those, and still turning to apt-get to install any needed system dependencies, like graphviz or core system libraries.
$ type pip3 pip2 pip
bash: type: pip3: not found
bash: type: pip2: not found
bash: type: pip: not found
$ python3 -m pip --version
/usr/bin/python3: No module named pip
So to install pip, again, it's as easy as sudo apt-get install python-pip :
$ sudo apt-cache search -n pip | egrep '^python[0-9]*-pip'
python-pip - alternative Python package installer
python-pip-whl - alternative Python package installer
python3-pip - alternative Python package installer - Python 3 version of the package
You'll need both python-pip for the Python 2.7 pip and the python3-pip for the Python 3 pip. The installation via apt-get is sure to install the required dependencies; e.g, here's the output for installing pip2:
$ sudo apt-get install python-pip
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
binutils build-essential dpkg-dev fakeroot g++ g++-5 gcc gcc-5 libalgorithm-diff-perl
libalgorithm-diff-xs-perl libalgorithm-merge-perl libasan2 libatomic1 libc-dev-bin libc6-dev
libcc1-0 libcilkrts5 libdpkg-perl libexpat1-dev libfakeroot libfile-fcntllock-perl libgcc-5-dev
libgomp1 libitm1 liblsan0 libmpx0 libpython-all-dev libpython-dev libpython-stdlib libpython2.7
libpython2.7-dev libquadmath0 libstdc++-5-dev libtsan0 libubsan0 linux-libc-dev make
manpages-dev python python-all python-all-dev python-dev python-minimal python-pip-whl
python-pkg-resources python-setuptools python-wheel python2.7-dev
Suggested packages:
binutils-doc debian-keyring g++-multilib g++-5-multilib gcc-5-doc libstdc++6-5-dbg gcc-multilib
autoconf automake libtool flex bison gdb gcc-doc gcc-5-multilib gcc-5-locales libgcc1-dbg
libgomp1-dbg libitm1-dbg libatomic1-dbg libasan2-dbg liblsan0-dbg libtsan0-dbg libubsan0-dbg
libcilkrts5-dbg libmpx0-dbg libquadmath0-dbg glibc-doc libstdc++-5-doc make-doc python-doc
python-tk python-setuptools-doc
The following NEW packages will be installed:
binutils build-essential dpkg-dev fakeroot g++ g++-5 gcc gcc-5 libalgorithm-diff-perl
libalgorithm-diff-xs-perl libalgorithm-merge-perl libasan2 libatomic1 libc-dev-bin libc6-dev
libcc1-0 libcilkrts5 libdpkg-perl libexpat1-dev libfakeroot libfile-fcntllock-perl libgcc-5-dev
libgomp1 libitm1 liblsan0 libmpx0 libpython-all-dev libpython-dev libpython-stdlib libpython2.7
libpython2.7-dev libquadmath0 libstdc++-5-dev libtsan0 libubsan0 linux-libc-dev make
manpages-dev python python-all python-all-dev python-dev python-minimal python-pip
python-pip-whl python-pkg-resources python-setuptools python-wheel python2.7-dev
0 upgraded, 49 newly installed, 0 to remove and 0 not upgraded.
Need to get 61.1 MB of archives.
After this operation, 169 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
...etc...
An interesting thing happens as a result of this: you now have the "standard" (and PEP recommended) python2 and python3 (which are just symlinks to python 2.7 and python 3.5):
$ type python3 python2 python python2.7 python3.5
python3 is /usr/bin/python3
python2 is /usr/bin/python2
python is /usr/bin/python
python2.7 is /usr/bin/python2.7
python3.5 is /usr/bin/python3.5
You'll also want to sudo apt-get install python3-pip; before you install, you have:
$ type pip pip2 pip3
pip is /usr/bin/pip
pip2 is /usr/bin/pip2
-bash: type: pip3: not found
$ python2 -m pip --version
pip 8.1.1 from /usr/lib/python2.7/dist-packages (python 2.7)
$ python3 -m pip --version
/usr/bin/python3: No module named pip
After installing pip3,
$ sudo apt-get install python3-pip
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
libpython3-dev libpython3.5-dev python3-dev python3-setuptools python3-wheel python3.5-dev
Suggested packages:
python-setuptools-doc
The following NEW packages will be installed:
libpython3-dev libpython3.5-dev python3-dev python3-pip python3-setuptools python3-wheel python3.5-dev
0 upgraded, 7 newly installed, 0 to remove and 0 not upgraded.
Need to get 38.0 MB of archives.
After this operation, 55.2 MB of additional disk space will be used.
Do you want to continue? [Y/n]
...etc...
The resulting versions:
$ type python python2 python3 pip pip2 pip3
python is /usr/bin/python
python2 is hashed (/usr/bin/python2)
python3 is hashed (/usr/bin/python3)
pip is /usr/bin/pip
pip2 is /usr/bin/pip2
pip3 is /usr/bin/pip3
$ pip --version
pip 8.1.1 from /usr/lib/python2.7/dist-packages (python 2.7)
$ pip3 --version
pip 8.1.1 from /usr/lib/python3/dist-packages (python 3.5)
$ python2 -m pip --version
pip 8.1.1 from /usr/lib/python2.7/dist-packages (python 2.7)
$ python3 -m pip --version
pip 8.1.1 from /usr/lib/python3/dist-packages (python 3.5)
And one last thing before you can go and start installing all your favorite python PyPI modules: you'll probably have to upgrade pip itself (both pip2 and pip3, separately; also, it doesn't matter if pip is invoked via the python executables or the pip executables, the actual upgrades are stored in /usr/lib):
$ sudo -H python2 -m pip install --upgrade pip
...
$ sudo -H python3 -m pip install --upgrade pip
...
You can now run either the stand-alone pip or the version bundled within python (via python -m pip {command}).
[1] Historical recap: older Ubuntu had only Python 2.6, thus all the various methods to get Python 2.7+ installed. Later, after Python 2.7 was added to the public repositories, we still had the same challenge to install the newest Python 2.7 with latest fixes, which was (too) frequently necessary. The situation today is much better/simpler: the current Python 2.7 & 3.5 (basically the only two Python platform versions people care about) that are now in the public repos are very stable, so now we really only have to worry about installing the latest python modules, not the latest python. So now the Python "latest version problem" has moved partly out of the OS repos & apt and into PyPI & pip.)