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Hi,I have a strange idea:is there any way to get memory address of a
object.

For example:

i = 10

addr = get_address(i)
address will be assigned a integer which is pointer of object
i,then I want to recast addr into another integer:

j = cast(addr,<type int>)

I think it is easy to get it by modifying source code of python,but I
would like to know if there was an existing one.

many thanks

On 10ÔÂ24ÈÕ, ÏÂÎç12ʱ51·Ö, mujuns...@gmail.com wrote:
> Hi,I have a strange idea:is there any way to get memory address of a
> object.
>
> For example:
>
> i = 10
>
> addr = get_address(i)
> address will be assigned a integer which is pointer of object
> i,then I want to recast addr into another integer:
>
> j = cast(addr,<type int>)
>
> I think it is easy to get it by modifying source code of python,but I
> would like to know if there was an existing one.
>
> many thanks

maybe id(x) can get it ,but how to cast it back into a object

On Fri, Oct 24, 2008 at 2:51 PM, <> wrote:
> Hi,I have a strange idea:is there any way to get memory address of a
> object.

id(obj)

Example:

>>> x = 10
>>> id(x)
134536908

But this probably (most likely) isn't it's address in memory
but more it's unique identifier that separates it from every
other object in memory.

> j = cast(addr,<type int>)

You can't do this in Python afaik nor would you want to.

If you simply want to copy an object, do this:

>>> x = 10
>>> y = x
>>> id(x)
134536908
>>> id(y)
134536908
>>>

cheers
James

--
--
-- "Problems are solved by method"

On Fri, Oct 24, 2008 at 2:58 PM, <> wrote:
> maybe id(x) can get it ,but how to cast it back into a object

You can't. Python is NOT C/C++/Java or whatever.

If you have a variable, x, and you want to "copy" it
to another variable, y. Use assignment.

Most (if not all) objects in python a referenced.
A lot of types are also immutable.

Describe your problem, perhaps we may be able to
provide you a "better" solution ? Can I statically re-cast
an object into a different type by getting the address
of another object .... is not a very good problem.

If you're after, coercing one type into another, for example:

>>> x = 2
>>> y = "2"
>>> z = int(y)
>>> x
2
>>> y
'2'
>>> z
2
>>>

cheers
James

--
--
-- "Problems are solved by method"

On 10ÔÂ24ÈÕ, ÏÂÎç1ʱ10·Ö, "James Mills" <prolo...@shortcircuit.net.au>
wrote:
> On Fri, Oct 24, 2008 at 2:58 PM, <mujuns...@gmail.com> wrote:
> > maybe id(x) can get it ,but how to cast it back into a object
>
> You can't. Python is NOT C/C++/Java or whatever.
>
> If you have a variable, x, and you want to "copy" it
> to another variable, y. Use assignment.
>
> Most (if not all) objects in python a referenced.
> A lot of types are also immutable.
>
> Describe your problem, perhaps we may be able to
> provide you a "better" solution ? Can I statically re-cast
> an object into a different type by getting the address
> of another object .... is not a very good problem.
>
> If you're after, coercing one type into another, for example:
>
>
>
> >>> x = 2
> >>> y = "2"
> >>> z = int(y)
> >>> x
> 2
> >>> y
> '2'
> >>> z
> 2
>
> cheers
> James
>
> --
> --
> -- "Problems are solved by method"

Thank you,James.
My original idea was to study all the contents of any object. I can do
it by using module ctypes.

On Sat, Oct 25, 2008 at 12:25 AM, <> wrote:
> Thank you,James.
> My original idea was to study all the contents of any object. I can do
> it by using module ctypes.

You can simply just query it's attributes.

Use __dict__ or dir(obj)

Example:

>>> x = 10
>>> dir(x)
['__abs__', '__add__', '__and__', '__class__', '__cmp__',
'__coerce__', '__delattr__', '__div__', '__divmod__', '__doc__',
'__float__', '__floordiv__', '__getattribute__', '__getnewargs__',
'__hash__', '__hex__', '__index__', '__init__', '__int__',
'__invert__', '__long__', '__lshift__', '__mod__', '__mul__',
'__neg__', '__new__', '__nonzero__', '__oct__', '__or__', '__pos__',
'__pow__', '__radd__', '__rand__', '__rdiv__', '__rdivmod__',
'__reduce__', '__reduce_ex__', '__repr__', '__rfloordiv__',
'__rlshift__', '__rmod__', '__rmul__', '__ror__', '__rpow__',
'__rrshift__', '__rshift__', '__rsub__', '__rtruediv__', '__rxor__',
'__setattr__', '__str__', '__sub__', '__truediv__', '__xor__']
>>>

cheers
James

--
--
-- "Problems are solved by method"