On Dec 14, 2007 12:19 PM, mekaj <[EMAIL PROTECTED]> wrote:
> Now I would expect that when I call print_partitions(x), where 'x' is
> an Integer that SAGE would print all possible partitions of 'x'. The
> first time I call the function it works as expected. However, for
> each call after that, it seems to concatenate the results to the
> results of all the previous calls.
The issue is with Python's calling model which is, roughly speaking,
"call by object". This kind of thing is possible:
def foo(y):
y.append(0)
sage: mylist = []
sage: foo(mylist)
sage: foo(mylist)
sage: mylist
[0, 0]
Here's a bit of an explanation about Python's calling model:
http://effbot.org/zone/call-by-object.htm
So it's not exactly call by reference or call by value, but a bit of both.
--
Carlo Hamalainen
http://carlo-hamalainen.net
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