Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #92398

Re: enhancement request: make py3 read/write py2 pickle format

Show all headers | View raw

On Wed, Jun 10, 2015, at 08:08, Marko Rauhamaa wrote:
> You can't serialize/migrate arbitrary objects. Consider open TCP
> connections, open files and other objects that extend outside the Python
> VM. Also objects hold references to each other, leading to a huge
> reference mesh.
> 
> For example:
> 
>    a.buddy = b
>    b.buddy = a
>    with open("a", "wb") as f: f.write(serialize(a))
>    with open("b", "wb") as f: f.write(serialize(b))
> 
>    with open("a", "rb") as f: aa = deserialize(f.read())
>    with open("b", "rb") as f: bb = deserialize(f.read())
>    assert aa.buddy is bb

Of course, if you serialize a single dict with e.g. {'a': a, 'b': b},
you can expect (with advanced serialization tools, anyway  - I suspect
JSON will just make a mess or exceed maximum recursion depth)
result['a'].buddy is result['b']

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: enhancement request: make py3 read/write py2 pickle format Robert Kern <robert.kern@gmail.com> - 2015-06-10 12:22 +0100
  Re: enhancement request: make py3 read/write py2 pickle format Marko Rauhamaa <marko@pacujo.net> - 2015-06-10 15:08 +0300
    Re: enhancement request: make py3 read/write py2 pickle format random832@fastmail.us - 2015-06-10 09:38 -0400
    Re: enhancement request: make py3 read/write py2 pickle format Robert Kern <robert.kern@gmail.com> - 2015-06-10 14:52 +0100
      Re: enhancement request: make py3 read/write py2 pickle format Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-06-11 11:30 +1200
        Re: enhancement request: make py3 read/write py2 pickle format random832@fastmail.us - 2015-06-10 20:47 -0400

csiph-web