How to install Python 3.5.1 on Ubuntu 16.04 LTS?

Question

I want to install Python 3.5.1 on my Ubuntu 16.04 LTS. I have been searching but I still can't figure it out. I tried to find Python 3.5.1 in the Software Center but I couldn't find it.

Edit: I actually want to run IDLE 3, the Python IDE for Python 3.

Can someone tell me a step by step instruction on how to install it?

Solution

Python 3.5.1 is installed on Ubuntu 16.04 by default. You can verify that by running the command python3 --version in a terminal.

Now, IDLE for Python 3 is in the package idle3 and part of the default Python distribution but it's not installed on Ubuntu by default. You can do so with Software Center or your favourite package manager. On the command-line you can run:

sudo apt-get install idle3

If that gives you an error as you say in the comments, please edit your question with the "edit" link below it to include the error messages verbatim (and send me a message in the comments to notify me of the change), or ask a new question with the same information.

Comments

[edwinksl]

16.04 comes with Python 3.5.1. Can you try which python3 and python3 --version and give us the outputs?

[edwinksl]

Can you first tell us what which python3 say? I want to make sure Python 3 is already on your system. As for your question regarding IDLE, IDLE is not installed by default. There is no reason why Python 3 must come together with IDLE. If you want it, do sudo apt install idle3.

[Admin]

which python3 returns /usr/local/bin/python3, python3 --version returns Python 3.5.1

[Admin]

I tried sudo apt install idle3 and there is an error saying E: Sub-process /usr/bin/dpkg return an error code (1)

[Admin]

I can't resolve the error but I did download IDLE3. How should I fix the error?

[edwinksl]

Search this site for that error; there are plenty of questions and answers regarding that. If you can't find a solution, feel free to ask a question.

[edwinksl]

No problem at all. Enjoy using Ubuntu and Python!