Why can't I run IDLE on python3?

Question

linux

The fact is that when I run the idle command, the version for python 2.7.6 opens for me, and not for python 3rd version.
Tried to prescribe python3 idle, no response. The same with the installation, I write sudo apt-get install python3-idle (I tried it without a dash, I also tried to write just install idle-3, etc.)
If I'm a beginner, so don't judge strictly.
Os Ubuntu, and by the way, one more question. There are two versions of python at once, is this normal? when you type python, it says that the version of python 2.x is installed, and when you type python3 , it says the same about version 3.x (what is the newest version of python3, is it supposed to be?
And thanks in advance for the answers.

Answer 1

try to run idle3if it does not start write sudo apt-get install idle3