On Friday, May 20, 2016 at 9:05:51 PM UTC-4, jf...@ms4.hinet.net wrote:
> Is there any tools which can do the memory dump of an object so I can view
> their content or implementation? For example,
>
> >>> s1 = '\x80abc'
> >>> b1 = b'\x80abc'
>
> What are exactly stored in memory for each of them? Is their content really
> the same? This kind of tool should be helpful "for me" to learn the inner
> detail of Python.
I don't know of a tool that will do that, other than running CPython under
the gdb debugger, and examining memory that way.
In Python 2, those two objects are the same, because '...' is a byte string,
and b'...' is a byte string.
I should say, those objects' memory starts out exactly the same. Objects have
reference counts which change as names come and go:
>>> s1 = '\x80abc'
>>> b1 = b'\x80abc'
>>> b2 = b1
Now the first string has a reference count of 1, and b1 has a reference count
of 2. Those counts are in the objects' memory, so now their memory contents
are different.
--Ned.
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