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Pickling

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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Fri 08 Apr 2005 06:09 PM (UTC)
Message
Any idea why this doesn't work?

from pickle import *
a = {}
world.SetVariable("a", dumps(a))
a = loads(world.GetVariable("a"))

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Posted by Ked   Russia  (524 posts)  [Biography] bio
Date Reply #1 on Sat 09 Apr 2005 04:06 AM (UTC)
Message
That's because of Unicode. You need to convert the result of world.GetVariable back to ascii before it can be loaded. To do that use:


import pickle, codecs

#get the encoder function, this will return a tuple with the 
#string in first element
enc = codecs.getencoder('utf8')

a= {}
world.SetVariable("a", pickle.dumps(a))

#first encode then loads()
d = pickle.loads(enc(world.GetVariable("a")[0]))

#check what it is
world.Note(repr(d))
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Posted by Ked   Russia  (524 posts)  [Biography] bio
Date Reply #2 on Sat 09 Apr 2005 04:13 AM (UTC)
Message
If you want to do the pickling/unpickling alot then you can just proxy the loads function:


import pickle, codecs

def loads(uString):
    enc = codecs.getencoder('utf8')
    return pickle.loads(enc(uString)[0])

d = loads(world.GetVariable("a"))
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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Reply #3 on Sat 09 Apr 2005 10:32 AM (UTC)
Message
Oh great, thanks! I would have never thought about Unicode, is it MC that converts to unicode, or Python that expects a unicode string? By the way, there is a small error in your first post,
d = pickle.loads(enc(world.GetVariable("a")[0]))
should be
d = pickle.loads(enc(world.GetVariable("a"))[0]).
Thanks again.

Vidi, Vici, Veni.
http://porocrom.poromenos.org/ Read it!
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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Reply #4 on Sat 09 Apr 2005 10:41 AM (UTC)
Message
Okay, I CANNOT get this to work. Where's a debugger when you need one :/ This is my code:

def OnPluginInstall():
    if world.GetVariable("varAreas"):
        encUnicode = getencoder('utf8')
        dicAreas = pickle.loads(encUnicode(world.GetVariable("varAreas"))[0])

def OnPluginSaveState():
    world.SetVariable("varAreas", pickle.dumps(dicAreas))

def fnShowInfo(strName, strLine, strWildcards):
    for strItem, lstContents in dicAreas.items():
        world.note(strItem)

I populate the dictionary and reload the plugin. It shows me that it saved and loaded the correct pickled string, but when I call fnShowInfo after loading, it displays nothing. Any ideas?

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http://porocrom.poromenos.org/ Read it!
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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Reply #5 on Sat 09 Apr 2005 05:48 PM (UTC)
Message
Hmm, somehow I don't think it's the same variable after unpickling... It is dead inside, it is not the same variable I married. I dumps, loads, it appears to be OK when I repr() it, but the enumeration doesn't work. And, if I dumps it again, the second loads returns nothing.

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http://porocrom.poromenos.org/ Read it!
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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Reply #6 on Sat 09 Apr 2005 05:51 PM (UTC)
Message
OK, I think I have found the problem. I think it is scoping, it's OK when unpickled, but it somehow doesn't survive past that function. I'm a bit hazy on using globals in python, doesn't "global dicAreas" means that it'll act the same as a global in VBScript, i.e. be the same variable in all scopes underneath it? I should really learn to edit my posts, by the way.

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http://porocrom.poromenos.org/ Read it!
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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Reply #7 on Sat 09 Apr 2005 06:22 PM (UTC)
Message
Okay, the folks at #python helped me realise the error of my ways. For future reference, you have to add
global dicAreas
wherever you want an assignment to go to a global variable instead of a local one.

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http://porocrom.poromenos.org/ Read it!
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Posted by Ked   Russia  (524 posts)  [Biography] bio
Date Reply #8 on Sun 10 Apr 2005 06:09 AM (UTC)
Message
Yes, if you try to assign to a global object from local scope, Python looks in that scope and if it doesn't find an object with that name it just presumes that you want a new local object created and does that. So once you exit the scope the new object is destroyed and the global one had never had any assignments to it. A very common mistake. You can read from a global object without declaring it though.
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Posted by Ked   Russia  (524 posts)  [Biography] bio
Date Reply #9 on Sun 10 Apr 2005 06:50 AM (UTC)
Message
Oh, and I think that Unicode is the pywin32 thing actually, though I could be wrong but that's what is solely responsible for COM.
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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Reply #10 on Wed 13 Apr 2005 11:30 PM (UTC)
Message
Now I get an "insecure string pickle" error when I try to load the dumped dictionary. An entry in the dictionary consists of the following:

dicAreas[strWildcards[1]] = [strWildcards[0], strWildcards[2], strWildcards[3], "", [ "", "" ], ""]

Any ideas?

Vidi, Vici, Veni.
http://porocrom.poromenos.org/ Read it!
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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Reply #11 on Wed 13 Apr 2005 11:53 PM (UTC)
Message
Ah, got it... The last string should have been unicode, u""...

Vidi, Vici, Veni.
http://porocrom.poromenos.org/ Read it!
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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Reply #12 on Thu 14 Apr 2005 09:31 PM (UTC)

Amended on Thu 14 Apr 2005 09:39 PM (UTC) by Poromenos

Message
Okay... Now, whenever I load the pickled string, there is an appended \r in the end of each dictionary name. What's up with these pickling problems? Is it MC's variable handling? When I dump to a file I don't have to decode unicode or anything... This is very strange...

Vidi, Vici, Veni.
http://porocrom.poromenos.org/ Read it!
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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Reply #13 on Thu 14 Apr 2005 09:44 PM (UTC)

Amended on Sat 16 Apr 2005 12:32 PM (UTC) by Poromenos

Message
Could it be MC's XML library? Maybe it's storing \r\n but removing only the \n on load? Nick?

Vidi, Vici, Veni.
http://porocrom.poromenos.org/ Read it!
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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Reply #14 on Sat 16 Apr 2005 12:33 PM (UTC)
Message
Anything at all? :P Someone's paying me to write a script and I'm stuck because of this.

Vidi, Vici, Veni.
http://porocrom.poromenos.org/ Read it!
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