Explaining names vs variables in Python

[ast]

"Salvatore DI DIO" <salvatore.didio at gmail.com> a écrit dans le message de 
news:a894d5ed-d906-4ff7-a537-32bf0187e062 at googlegroups.com...

> It is a little difficult to explain this behavior to a newcommer in Python
> Can someone give me the right argument to expose ?


It is explained with many details here:
http://blog.lerner.co.il/why-you-should-almost-never-use-is-in-python/