Inconsistent reaction to extend

[Jerzy Karczmarczuk]

Gurus, before I am tempted to signal this as a bug, perhaps
you might convince me that it should be so. If I type

l=range(4)
l.extend([1,2])

l  gives [0,1,2,3,1,2], what else...

On the other hand, try

p=range(4).extend([1,2])

Then, p HAS NO VALUE (NoneType).

With append the behaviour is similar. I didn't try other methods, but
I suspect that it won't improve.


WHY?
It seems that there was already some discussion about consistency and
somebody produced the example:   h = {}.update(l)  which didn't work,
but I wasn't subscribed to this nsgr, I couldn't follow this affair.

Jerzy Karczmarczuk