kalab at my-deja.com kalab at my-deja.com
Fri Oct 6 06:29:40 EDT 2000

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In article <8ri8ba02lfe at news1.newsguy.com>,
  "Alex Martelli" <aleaxit at yahoo.com> wrote:
> The behaviour of any Python function is just like that of "thebyval":
> after a sequence such as
>     a=23
>     b=a
>     thepythonfunction(a)

it depends if the argument is mutable or not:
def change(a):
    a[0] = 24
a=[23]
b=a
print a, b
change(a)
print a, b

Output:
[23] [23]
[24] [24]

> it MUST, always, be the case that a and b are still identical, no
> matter how "thepythonfunction" is written (well... one could play
> dirty tricks to find and alter the caller's namespace, maybe, but
> I wouldn't recommend it!-).

You are right - a and b must always be identical since they are both
references.

Gerhard


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