debugger on system with Python 2 and 3

[Yo Sato]

Hi,

I am a relative newcomer to the Python language, and only write Python
3. Now I would very much like to a more-than-basic debugger. However
it seems as if the fact that I have both Python 2 and 3 on the system
complicates the matter...

First I tried to use something called pydb, but it seems to invoke
python 2, and I don't know quite how to (or whether I can) configure
it for Python 3.

Secondly I installed something called IDLE3, which complains that TK
is not configured for Python 3.

I don't want to remove or default to Python 2, as there seem to be a
number of programs that rely on it.

I wonder how best to avoid my problems. Would perhaps somebody in the
same sort of situation share their wisdom??

Yo