Install Mac OS X - Idle doesn't show up

[Dominique]

Hello,

Sorry bothering you with such a trivial problem.

I installed python on a new mac at office.
It seems everything is fine: in the console, I access to python.
But I just can't start Idle. It seems to open but closes immediately (it appears
in the dock and closes immediately).
It is also impossible to open any .py file.

I am sure some of you have a good idea of what to do (path,...).

Thanks in advance
Dominique