Thank you guys.

On Jan 11, 9:25 pm, Thadeus Burgess <thade...@thadeusb.com> wrote:
> It is because pv is a pointer to the memory that holds its list.
>
> When you append pv to val, your appending the *reference* to pv.
>
> So whenever you update pv, all references to pv also reflect these changes.
>
> The reason that slicing pv with [:] works is because you are making a
> copy of pv, and appending the copy into val.
>
> The reason that pv = [i,0] works is because you assigning a new memory
> reference to pv.
>
> -Thadeus
>
> On Mon, Jan 11, 2010 at 9:46 AM, DenesL <denes1...@yahoo.ca> wrote:
> > e objects contain references to other objects; these are called
> > containers. Examples of containers are tuples, lists and dictionaries.
> > The references are part of a container's value. In most cases, when we
> > talk about the value of a container, we imply the values, not the
> > identities of the contained objects; however, when we talk about the
> > mutability of a container, only the identities of the immediately
> > contained objects are implied. So, if an immutable container (like a
> > tuple) contains a reference to a mutable object, its value changes if
> > that mutable object is cha
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