How to Install Python on Ubuntu Step by Step Guide

How to Install Python on Ubuntu Step by Step Guide

Check latest python version installed on Ubuntu

This is good news that Python comes pre-installed in Ubuntu 19.04. But question is still remain How will you check Latest python version on your Ubuntu operating system?

Most of tools and utility having special switch for checking version, same python have.

You can use following code to check latest python version

$python3 –version

vijay@Ubuntu-19:~$python3 --version
Python 3.7.3
vijay@Ubuntu-19:~$

How to install Python on Ubuntu

vijay@Ubuntu-19:~$sudo apt-get install python3 

If you want to install python on Ubuntu from another source then first get the link from Python’s official website, and download it manually or with help of wget utility.

I am using wget to download latest version.

$wget https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tgz

vijay@Ubuntu-19:~$wget https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tgz
--2019-06-19 10:39:49--  https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tgz
Resolving www.python.org (www.python.org)... 199.232.20.223, 2a04:4e42:42::223
Connecting to www.python.org (www.python.org)|199.232.20.223|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 22973527 (22M) [application/octet-stream]
Saving to: ‘Python-3.7.3.tgz’

Python-3.7.3.tgz        100%[==============================>]  21.91M   881KB/s    in 30s     

2019-06-19 10:40:19 (760 KB/s) - ‘Python-3.7.3.tgz’ saved [22973527/22973527] 

Next step to extract downloaded file.

$tar -xvf Python-3.7.3.tgz

vijay@Ubuntu-19:~$tar -xvf Python-3.7.3.tgz

Move to Python-3.7.3 file after completing extraction process. Use the following command.

vijay@Ubuntu-19:~$cd Python-3.7.3/
vijay@Ubuntu-19:~/Python-3.7.3/$

Next step to run configure script to check the build.

vijay@Ubuntu-19:~/Python-3.7.3/$./configure

Once the checking process done use following two commands to install python on Ubuntu.

vijay@Ubuntu-19:~/Python-3.7.3/$sudo make
vijay@Ubuntu-19:~/Python-3.7.3/$sudo make install
zipimport.ZipImportError: can't decompress data; zlib not available
make: *** [Makefile:1130: install] Error 1
vijay@Ubuntu-19:~/Python-3.7.3/$

If you have got above error, It means one more tool required to complete this task (make install).

So what is now? One more task.

You will have to install one more tool to complete successfully install Python on Ubuntu. The tool name is zlib1g-dev and you can install by running following command.

vijay@Ubuntu-19:~/Python-3.7.3/$sudo apt-get install zlib1g-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  zlib1g-dev
0 upgraded, 1 newly installed, 0 to remove and 166 not upgraded.
Need to get 172 kB of archives.
After this operation, 437 kB of additional disk space will be used.
Get:1 http://in.archive.ubuntu.com/ubuntu disco/main amd64 zlib1g-dev amd64 1:1.2.11.dfsg-1ubuntu2 [172 kB]
Fetched 172 kB in 3s (59.7 kB/s)                        
Selecting previously unselected package zlib1g-dev:amd64.
(Reading database ... 136237 files and directories currently installed.)
Preparing to unpack .../zlib1g-dev_1%3a1.2.11.dfsg-1ubuntu2_amd64.deb ...
Unpacking zlib1g-dev:amd64 (1:1.2.11.dfsg-1ubuntu2) ...
Setting up zlib1g-dev:amd64 (1:1.2.11.dfsg-1ubuntu2) ...
Processing triggers for man-db (2.8.5-2) ...
vijay@Ubuntu-19:~/Python-3.7.3/$

After installing the zlib1g-dev, run again both command $sudo make and $sudo make install.

I hope you will not get any error.

Update Python in Ubuntu to Latest Version

As you have seen above, I have python version is python 3.7.3 and the latest version is the same. This is really good news for me.

If you have old version of python installed on Ubuntu then you can update by using following commands:

$sudo apt-get udpate
$sudo apt-get upgrade python3

First command for update repository and second one is to update python.

vijay@Ubuntu-19:~$sudo apt-get upgrade python3
Reading package lists... Done
Building dependency tree       
Reading state information... Done
python3 is already the newest version (3.7.3-1).
python3 set to manually installed.
Calculating upgrade... Done
The following packages have been kept back:
  linux-generic linux-headers-generic linux-image-generic
The following packages will be upgraded:
  linux-libc-dev openvpn
2 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
Need to get 1,534 kB of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] 

Warning to update python on Ubuntu

If you have installed python on Ubuntu or other Linux distribution from other source. You have to following steps.

  1. Uninstall python on Ubuntu
  2. Download latest version from official website
  3. Again Install Python on Ubuntu.

How to uninstall Python on Ubuntu

Why do you want to uninstall python in Ubuntu or another Linux machine?

Why?

Why? Let me know in the comment box.

Whatever reason you have to uninstall python, but only two ways exist. If you have installed python from the repository (using the command $sudo apt-get install pyhton3.7). Then you can use the following command to uninstall python from your Ubuntu machine completely.

Warning: Don’t mention major version in command like Python3, because the python3 version is used by your system. Your system will get crashed. You can mention minor versions like python3.6 or Python3.7

vijay@Ubuntu-19:~$sudo apt remove python3.7
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  apg apport-symptoms aptdaemon-data avahi-utils command-not-found-data
  cups-pk-helper dc diffstat distro-info-data fprintd gettext
  gir1.2-accountsservice-1.0 gir1.2-atspi-2.0 gir1.2-dbusmenu-glib-0.4
  gir1.2-dee-1.0 gir1.2-gck-1 gir1.2-gcr-3 gir1.2-gdesktopenums-3.0
  gir1.2-gdm-1.0 gir1.2-geoclue-2.0 gir1.2-geocodeglib-1.0
  gir1.2-gnomebluetooth-1.0 gir1.2-gnomedesktop-3.0 gir1.2-goa-1.0
  gir1.2-gst-plugins-base-1.0 gir1.2-gstreamer-1.0 gir1.2-gtksource-4
  gir1.2-gudev-1.0 gir1.2-gweather-3.0 gir1.2-ibus-1.0

Press Y for confirmation to remove python from your system

Way 2: If you have installed python from other sources, Then you can remove only python files from the path /usr/local/bin. To do so you can run the following commands:

$sudo rm /usr/local/bin/py*
$sudo rm /usr/local/bin/pip*
$sudo rm /usr/local/bin/idle*
$sudo rm /usr/local/bin/2to3*
$sudo rm /usr/local/bin/easy_install-3.7

Conclusion

You have learnt how to install python on Linux, If you have any question please leave in comment box.

Thanks for Reading

Cheers!

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