list storing variables
Ian Kelly
ian.g.kelly at gmail.com
Mon Feb 23 14:29:33 EST 2015
On Mon, Feb 23, 2015 at 12:06 PM, Marko Rauhamaa <marko at pacujo.net> wrote:
> But there is! I just demonstrated it in a previous posting:
>
>> In Python, you can accomplish "&" by creating an object:
>>
>> >>> a = 3
>> >>> b = 4
>> >>> class AmpersandA:
>> ... def get(self): return a
>> ... def set(self, value): global a; a = value
>> ...
>> >>> class AmpersandB:
>> ... def get(self): return b
>> ... def set(self, value): global b; b = value
>> ...
>> >>> l = [ AmpersandA(), AmpersandB() ]
>> >>> for m in l:
>> ... m.set(7)
>> ...
>> >>> print(a)
>> 7
>> >>> print(b)
>> 7
>> >>>
>>
>> It's exactly like "&" in C escept it's a slight bit more verbose and the
>> exact implementation is dependent on the name of the variable.
"Sure, you can have list comprehensions in C! Just write a function
whose arguments are two other functions and an input array."
Obviously one can use any Turing-complete language to emulate features
of any other Turing-complete language, but I think the point is that
there is no syntactic support for it.
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