LJ <luisjosenovoa at gmail.com>: >>>> id(b[0]) > 45855552 [...] >>>> id(b[2]) > 45855552 > > Please correct me if I am wrong, but according to this b[2] and b[0] > are the same object. Now, > >>>> b[0] is b[2] > False This is a true statement: If X is Y, then id(X) == id(Y). However, this is generally not a true statement: If X is Y, then id(X) is id(Y). Marko