On Mon, Jun 17, 2013 at 11:55 AM, Simpleton <supp...@superhost.gr> wrote:
> On 17/6/2013 5:22 μμ, Terry Reedy wrote: > >> On 6/17/2013 7:34 AM, Simpleton wrote: >> >>> On 17/6/2013 9:51 πμ, Steven D'Aprano wrote: >>> >>>> Now, in languages like Python, Ruby, Java, and many others, there is no >>>> table of memory addresses. Instead, there is a namespace, which is an >>>> association between some name and some value: >>>> >>>> global namespace: >>>> x --> 23 >>>> y --> "hello world" >>>> >>> >>> First of all thanks for the excellent and detailed explanation Steven. >>> >>> As for namespace: >>> >>> a = 5 >>> >>> 1. a is associated to some memory location >>> 2. the latter holds value 5 >>> >> >> This is backwards. If the interpreter puts 5 in a *permanent* 'memory >> location' (which is not required by the language!), then it can >> associate 'a' with 5 by associating it with the memory location. CPython >> does this, but some other computer implementations do not. >> > > Please tell me how do i need to understand the sentence > 'a' is being associated with number 5 in detail. > > Why don't we access the desired value we want to, by referencing to that > value's memory location directly instead of using namespaces wich is an > indirect call? > > i feel we have 3 things here > > a , memory address of a stored value, actual stored value > > So is it safe to say that in Python a == &a ? (& stands for memory >>> address) >>> >>> is the above correct? >>> >> >> When you interpret Python code, do you put data in locations with >> integer addresses? >> > > I lost you here. > > > > -- > What is now proved was at first only imagined! > -- > http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list> > Read and study this. Then come back and ask again. Don't think of physical representation of memory with actual binary addresses. Python is not assembler. Neither is it C (sometimes called high level assembler) http://docs.python.org/2/tutorial/classes.html#python-scopes-and-namespaces -- Joel Goldstick http://joelgoldstick.com
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