Binding a variable?

Steven D'Aprano steve at REMOVETHIScyber.com.au
Sun Oct 23 01:52:10 CEST 2005


On Fri, 21 Oct 2005 13:33:18 -0400, Mike Meyer wrote:

> Paul Dale <pd at traxon.com> writes:
> 
>> Hi everyone,
>>
>> Is it possible to bind a list member or variable to a variable such that
>>
>> temp = 5
>>
>> list = [ temp ]

Don't use the names of built-in functions as variables.

>> temp == 6
>>
>> list
>>
>> would show
>>
>> list = [ 6 ]
> 
> No. You need to either put a mutable in the list, or subclass list so
> that indexing gets the value, looks it up in the appropriate
> namespace, and returns that value.


Or something even conceptually simpler than having to muck about with
looking up different namespaces:

class Data:
    def __init__(self, obj):
        self.value = obj
    def __str__(self):
        return self.value

temp = Data(5)
L = [temp]
print L

will give 5.

temp.value = 6
print L

will now give 6.


-- 
Steven.




More information about the Python-list mailing list