List mutation method gotcha - How well known?

Chris cwitts at gmail.com
Thu Mar 13 10:31:38 CET 2008


On Mar 13, 9:36 am, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:
> Hi,
>
> I am surprised that it took me so long to bloody my nose on this one.
>
> It must be well known - and I would like to find out how well known.
>
> So here is a CLOSED BOOK multiple choice question - no RTFM,
> no playing at the interactive prompt:
>
> Given the following three lines of code at the interactive prompt:
>
> foo = [1,2,3,4]
> x = foo.append(5)
> print x
>
> What will be the output (choose one):
>
> 1)  [1,2,3,4]
> 2)  [1,2,3,4,5]
> 3)  That famous picture of Albert Einstein sticking out his tongue
> 4)  Nothing - no output
> 5)  None of the above
>
> I undertake to summarise answers posted to complete this "survey".
>
> - Hendrik

No output because x is a NoneType...



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