I have Python 3.4 installed on my Linux computer.

```
sudo apt-get install python3.4

```

However, when I run `python -V`, it shows that Python 2.7.6 is being used.

How do I tell the system to use the updated version of Python?

The answer to this question for a windows computer is at [How to update version of Python?](https://stackoverflow.com/questions/5089939/how-to-update-version-of-python), but I couldn't find an answer for Linux.