Why does extend() fail in this case, and what am I doing wrong?

[Jochen Schulz]

Xavier Ho:
>
> Why doesn't the second output print [1, 2, 3, .... , 7, 8, 9] ?
-- snip
> print a.n.extend([6, 7, 8, 9])

extend doesn't fail. It just returns None and extends the list in place.

In [1]: l = [1, 2, 3]

In [2]: l.extend([4, 5, 6])

In [3]: l
Out[3]: [1, 2, 3, 4, 5, 6]


J.
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