help on pickle tool

**hanumizzle** · Oct 6 '06, 08:35 AM

Re: help on pickle tool

On 6 Oct 2006 01:41:48 -0700, virg <06virg@gmail.c omwrote:

Hi,
The data is simple dictionary with one or more keys. If i use YAML at
the client (webui) do i have to change serialisation method to YAML at
server also. Without changing serialisation method at server, can i use
any of the deserialisation methods at the client. We cannot change the
serialisation methods at the server since it is not under our control.

Oh, poopy.

What do you have at the server end?

-- Theerasak

**Steve Holden** · Oct 6 '06, 08:45 AM

Re: help on pickle tool

Fredrik Lundh wrote:

MonkeeSage wrote:
>
>
>

>>YAML is a little more complex

>
>
a little? when did you last look at the spec?
>
>

>>and a little more mature.

>
>
than JavaScript's expression syntax? are you sure you're not confusing
libraries with standards here? (has anyone even managed to write a YAML
library that's small and simple enough to be "obviously correct"?)

I have to agree that YAML, having started out with simplicity in mind,
has become a monster that threatens to collapse under its own weight.
The very existence of JSON is a good indicator that YAML has failed to
meet its design goals for a significant proportion of application
developers.

regards
Steve
--
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC/Ltd http://www.holdenweb.com
Skype: holdenweb http://holdenweb.blogspot.com
Recent Ramblings http://del.icio.us/steve.holden

**virg** · Oct 6 '06, 08:45 AM

Re: help on pickle tool

At the server, based on client request it does some computations , it
sends the result as dictionary (serialized) to the client.

hanumizzle wrote:

On 6 Oct 2006 01:41:48 -0700, virg <06virg@gmail.c omwrote:

Hi,
The data is simple dictionary with one or more keys. If i use YAML at
the client (webui) do i have to change serialisation method to YAML at
server also. Without changing serialisation method at server, can i use
any of the deserialisation methods at the client. We cannot change the
serialisation methods at the server since it is not under our control.

>
Oh, poopy.
>
What do you have at the server end?
>
-- Theerasak

**hanumizzle** · Oct 6 '06, 08:55 AM

Re: help on pickle tool

On 10/6/06, Steve Holden <steve@holdenwe b.comwrote:

I have to agree that YAML, having started out with simplicity in mind,
has become a monster that threatens to collapse under its own weight.
The very existence of JSON is a good indicator that YAML has failed to
meet its design goals for a significant proportion of application
developers.

I am looking at JSON, but YAML does work fine for my purposes w/ no
discernable disadvantages. Of course I didn't implement the library,
so I can't really speak with any kind of expertise on this matter. I'm
just saying that, at least at the front end, it's pretty simple to
use. (JMO)

-- Theerasak

**hanumizzle** · Oct 6 '06, 09:05 AM

Re: help on pickle tool

On 6 Oct 2006 02:03:07 -0700, virg <06virg@gmail.c omwrote:

At the server, based on client request it does some computations , it
sends the result as dictionary (serialized) to the client.

If I interpret your message correctly, you are receiving a Python
dictionary object from the server. Yes? In this case, I guess it might
be necessary to use Jython. I'm drawing a blank otherwise.

(This may be naive, but can you write the client in Python as well?)

-- Theerasak

**virg** · Oct 6 '06, 09:15 AM

Re: help on pickle tool

Yes your are right. I will send a dictionary object from the server to
the client.
I already have client which is written in python. But we are migrating
the python client which is a command line tool to Web UI client
(java). If it is possible to call python function from java, i need to
read more about jython, i am new to this.

hanumizzle wrote:

On 6 Oct 2006 02:03:07 -0700, virg <06virg@gmail.c omwrote:

At the server, based on client request it does some computations , it
sends the result as dictionary (serialized) to the client.

>
If I interpret your message correctly, you are receiving a Python
dictionary object from the server. Yes? In this case, I guess it might
be necessary to use Jython. I'm drawing a blank otherwise.
>
(This may be naive, but can you write the client in Python as well?)
>
-- Theerasak

**hanumizzle** · Oct 6 '06, 09:45 AM

Re: help on pickle tool

On 6 Oct 2006 02:29:59 -0700, virg <06virg@gmail.c omwrote:

Yes your are right. I will send a dictionary object from the server to
the client.
I already have client which is written in python. But we are migrating
the python client which is a command line tool to Web UI client
(java).

Please explain 'Web UI'. Can Python perform an equivalent function?

-- Theerasak

**virg** · Oct 6 '06, 10:55 AM

Re: help on pickle tool

Hi,

Yes, using python client we are able deserialize data using

r = pickle.loads(re sult).

where result is a response from the server and r is a dictionary after
deserialization .
For serialisation at the server written in python using
pickle.dumps(re sult, 2)

Now we are developing web based Client using java. So we are writing
client in java. If server and client are in python we dont see any
problems since we are using same serialisation tool "pickle". Now we
have seen problems because we are writing client in java. we did not
find equivalent function on java for this tool pickle. If i use
standard java desrialisation functions i am getting error as invalid
header becasue of incompatibility between python and java. Please help
me if you have any clue

regards,
- Virg

hanumizzle wrote:

On 6 Oct 2006 02:29:59 -0700, virg <06virg@gmail.c omwrote:

Yes your are right. I will send a dictionary object from the server to
the client.
I already have client which is written in python. But we are migrating
the python client which is a command line tool to Web UI client
(java).

>
Please explain 'Web UI'. Can Python perform an equivalent function?
>
-- Theerasak

**Paddy** · Oct 6 '06, 06:55 PM

Re: help on pickle tool

hanumizzle wrote:

On 5 Oct 2006 22:25:58 -0700, Paddy <paddy3118@nets cape.netwrote:
>

You might try picking the data with a different pickle formatter that
your Java can use. Maybe an XML pickler
(http://www.gnosis.cx/download/Gnosis...1.2.1.ANNOUNCE
untested by me).
You might also use a JSON/YAML pickler. JSON is now a subset of YAML:

>
Why a subset?

I was referring to comments ike:

http://redhanded.hobix.com/inspect/yamlIsJson.html

http://redhanded.hobix.com/inspect/jsonCloserToYamlButNoCigarThanksAlotWhitespace.html

Happy coding - Paddy.

**Paddy** · Oct 6 '06, 07:05 PM

Re: help on pickle tool

Paddy wrote:

hanumizzle wrote:

On 5 Oct 2006 22:25:58 -0700, Paddy <paddy3118@nets cape.netwrote:

You might try picking the data with a different pickle formatter that
your Java can use. Maybe an XML pickler
(http://www.gnosis.cx/download/Gnosis...1.2.1.ANNOUNCE
untested by me).
You might also use a JSON/YAML pickler. JSON is now a subset of YAML:

>

Why a subset?

>
I was referring to comments ike:

http://redhanded.hobix.com/inspect/yamlIsJson.html

>

http://redhanded.hobix.com/inspect/jsonCloserToYamlButNoCigarThanksAlotWhitespace.html

>
Happy coding - Paddy.

Oh, and this might also be of use:

http://www-128.ibm.com/developerworks/web/library/x-matters46/index.html

- Pad.

**Kirill Simonov** · Oct 9 '06, 07:35 PM

Re: help on pickle tool

Hi,

I'm somewhat late to this discussion, but as the author of PyYAML, I'd
like to put my 2c in.

On Thu, Oct 05, 2006 at 09:52:56PM -0700, virg wrote:

Is it possible to deserialize the data by java which serialized by
Python or is there any compatibility issue. Is there any equivalent
pickle tool on java which supports this operation. so that i can use
across languages.

You may serialize/deserialize your data to YAML using PyYAML
(http://pyyaml.org/wiki/PyYAML) on the Python side and jvyaml
(https://jvyaml.dev.java.net/) on the Java side. You may also check
JSON (http://json.org/) as other posters suggested.

On Thu, Oct 05, 2006 at 10:54:46PM -0700, MonkeeSage wrote:

hanumizzle wrote:

Why a subset?

>
I don't think JSON is a subset of YAML.

It is.

On Fri, Oct 06, 2006 at 08:36:07AM +0200, Fredrik Lundh wrote:

JSON is almost identical to Python's expression syntax, of course,
while YAML isn't even close.

A valid Python list/dict expression is likely to be a valid YAML
expression. For instance

{ "odd": [1, 3, 5, 7, 9], "even": [2, 4, 6, 8] }

is both valid Python and valid YAML.

On Fri, Oct 06, 2006 at 08:28:29AM +0200, Fredrik Lundh wrote:

than JavaScript's expression syntax? are you sure you're not
confusing libraries with standards here? (has anyone even managed to
write a YAML library that's small and simple enough to be "obviously
correct"?)

I've written a complete YAML parser and I must admit it hasn't been
extremely difficult. The YAML syntax is very close to Python and I just
needed to rewrite YAML grammar using Python as a model. The PyYAML
parser is LL(1), which is as simple as it could be.

--
xi

help on pickle tool

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