vffgaston:
Is the arduino project addressed only to developpers?. (Look that I've said "project", not "forum")....
who said that arduino is just a (such a) professional bussines (arduino, I insist).
The Arduino project is for everyone. That includes artists, hobbyists, but also aspiring professionals. You can take it as far as you like. Arduino makes it easy to learn but what you learn is a professional programming language that is probably the second most commonly used language for embedded systems programmers. The most commonly used language is C and you'll essentially know that too. Python will not take you past the hobbyist level.
vffgaston:
Do you think that such a small quantity(es) pays a hobbyst the effort of learning "C++" instead of using python?
Of course not. I already said that. But when you're developing a product that will be made in quantities of hundreds of thousands or millions a small savings on the microcontroller will pay the effort of the programmers spending a little more time to write the code in C/C++ instead of Python. I brought this up as an argument against Python ever being commonly used by professional embedded systems programmers.