On Sat, 23 Feb 2008 22:44:30 +0000, Tim Roberts wrote:
> Marc 'BlackJack' Rintsch <[EMAIL PROTECTED]> wrote:
>
>>On Fri, 22 Feb 2008 11:00:17 -0800, Aahz wrote:
>>
>>> It's just too convenient to be able to write
>>>
>>> L += ['foo']
>>>
>>> without rebinding L.
>>
>><nitpick>But ``+=`` does rebind.</nitpick>
>
> Usually, but there's an exception for lists, which a specific
> implementation for += that calls "append". Or do I misunderstand you?
Terry Reedy showed the "tuple proof", here's the read only property case::
class A(object):
def __init__(self):
self._data = list()
@property
def data(self):
return self._data
a = A()
a.data += [42]
Output::
Traceback (most recent call last):
File "test.py", line 25, in <module>
a.data += [42]
AttributeError: can't set attribute
Ciao,
Marc 'BlackJack' Rintsch
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