list.clear() missing?!?

[Terry Reedy]

"Peter Hansen" <peter at engcorp.com> wrote in message 
news:e1k6ev$42c$1 at sea.gmane.org...
> It's not even clear that extend needs two lines:
>
> >>> s = range(5)
> >>> more = list('abc')
> >>> s[:] = s + more
> >>> s
> [0, 1, 2, 3, 4, 'a', 'b', 'c']

This is not the same as list.extend because it makes a separate 
intermediate list instead of doing the extension completely in place. 
However, the following does mimic .extend.

>>> s=range(5)
>>> s[len(s):] = list('abc')
>>> s
[0, 1, 2, 3, 4, 'a', 'b', 'c']

So. at the cost of writing and calling len(s), you are correct that .extend 
is not necessary.

Terry Jan Reedy