[PythonCE] pickle problem on 2.3.4 pythonCE (for wxPython)

[Luke Dunstan]

>From: "Matt S." <sleepingbull at gmail.com>
>To: "Luke Dunstan" <coder_infidel at hotmail.com>
>Subject: Re: [PythonCE] pickle problem on 2.3.4 pythonCE (for wxPython)
>Date: Sat, 27 May 2006 20:25:46 -0700
>
>Python 2.3.4 is the only Python interpreter I've seen wxPython
>compiled with for CE.  Did it work for you on 2.3.4 or 2.4.3?  If it
>did work on 2.4.3 for you do you have wxPython running as well?
>Thanks for the follow up.
>
>Matt

Yes, 2.4.3. Sorry, I don't have wxPython running as well. You might want to 
try 2.3.5 but I haven't tried it so there is no guarantee that it will fix 
the problem.

Luke

>
>On 5/27/06, Luke Dunstan <coder_infidel at hotmail.com> wrote:
>>Hi,
>>
>>Your test program works for me on PythonCE 2.4.3.
>>
>>Luke
>>
>>----- Original Message -----
>>From: "Matt S." <sleepingbull at gmail.com>
>>To: <pythonce at python.org>
>>Sent: Saturday, May 27, 2006 3:47 AM
>>Subject: [PythonCE] pickle problem on 2.3.4 pythonCE (for wxPython)
>>
>>
>> > Hi,
>> >
>> > I'm trying to make a data collection UI for Windows CE using the
>> > wxPyCE distribution (which uses Python 2.3.4)  found at,
>> >
>> > http://www.traybor.com/PythonCE/
>> >
>> > It's gone well so far but I'm running into a serious data pickling
>> > problem.  Ideally I would like to pickle a class instance.
>> >
>> > Saving and loading the pickled class works fine on my PC (Python 2.4x),
>> >
>> > *pickleDump.py*
>> > f = open('pickle_file.pyp', 'r')
>> > pickle.dump(my_class_instance, f)
>> >
>> > *pickleLoad.py*
>> > f = open('saved_pickle.pyp', 'r')
>> > my_pickled_class_instance = pickle.load(f)
>> >
>> > In my UI module the pickling are methods in a class.  Also, "my_class"
>> > is actually, "another_module.top_level_class.data," wherein ".data" is
>> > a dictionary with keys that are person names and values that are the
>> > corresponding person instance.
>> >
>> > Realizing that I'm probably breaking the pickling rules with pickling
>> > my data class, I changed "my_class" in *pickleDump.py* to a simple
>> > dictionary...  and it still failed on CE.  Fortunately, simplifying my
>> > data to a simple list does pickle.  So, in the worst case I can
>> > convert my data into lists (not pretty so if you have a better
>> > workaround idea I'd really appreciate it).
>> >
>> > Here's the traceback from my attempt to load the pickled dictionary,
>> >
>> > Traceback (most recent call last):
>> >  File "\Program Files\python\dev\pickleLoad.py", line 10, in ?
>> >    var = pickle.load(f)
>> >  File "binaries\lib\pickle.py", line 1390, in load
>> >  File "binaries\lib\pickle.py", line 872, in load
>> >  File "binaries\lib\pickle.py", line 985, in load_string
>> > LookupError: no codec search functions registered: can't find encoding
>> >
>> > Here are my test modules,
>> >
>> > *pickleDump.py*
>> >
>> > import pickle, traceback, sys
>> >
>> > f = open('test.txt','w')
>> > error = open('dump_error.txt','w')
>> > sys.stderr = error
>> > log = open('dump_out.txt','w')
>> > sys.stdout = log
>> >
>> > #var = [n for n in range(10)]
>> > var = {'parm1':1, 'parm2':'2a'}
>> >
>> > try:
>> >
>> >    pickle.dump(var,f)
>> >    print 'Pickled dumped OK in,', __file__
>> > except:
>> >    traceback.print_exc()
>> >    print 'Pickle dump failed! in', __file__
>> >
>> > f.close()
>> >
>> >
>> > *pickleLoad.py*
>> >
>> > import pickle, sys, traceback
>> >
>> > e = open('load_error.txt','w')
>> > sys.stderr = e
>> > s = open('load_out.txt','w')
>> > sys.stdout = s
>> >
>> > try:
>> >    f = open('test.txt','r')
>> >    var = pickle.load(f)
>> >    print 'Pickle loaded OK in,', __file__
>> >    print var
>> > except:
>> >
>> >    traceback.print_exc()
>> >    print 'Pickle not loaded in,', __file__
>> >
>> > Many thanks for your help,
>> > Matt
>>