cts.private.ya...@gmail.com wrote:
> As for python 3 ... "nonlocal"? I see I'm not alone in picking obnoxious
> names ...
tous chez...
> Alas, one reason it's a weak workaround is that it doesn't work - at
> least, not how I wish it would:
> $ cat ptrs
>
> x = 34
>
> def p1 (a1):
>
> a1[0] += 12
>
> p1 ([x])
>
> print (x)
>
> $ python ptrs
> 34
That doesn't work with 'nonlocal' either.
You can compare Python's names with (automatically dereferenced and
garbage-collected) pointers, but there is no way to have a name refer to
another name. The C-like
f(var *value)
{
value = ...
}
is the only way to pass a variable in Python. There is no way to emulate
f(var **value)
{
*value = ...
}
When this came up a few days ago I linked to
http://learntofish.wordpress.com/2012/01/09/call-by-object-reference-call-by-sharing/
but I was actually looking for the classic, so there:
http://python.net/~mwh/hacks/objectthink.html
PS: If you're reading this and love the French language -- I am deeply sorry
for the pain I'm causing you...
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