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Re: Python-pickle error

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From: tony.flury@btinternet.com (Tony Flury)
Newsgroups: comp.lang.python
Subject: Re: Python-pickle error
Date: Tue, 9 May 2023 07:45:34 +0100
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by: Tony Flury - Tue, 9 May 2023 06:45 UTC

Charles,

by your own admission, you deleted your pkl file,

And your code doesn't write that pkl file (pickle.dumps(...) doesn't
write a file it creates a new string and at no point will it write to
the file :

What you need is this :

import pickle
number=2
my_pickled_object=pickle.dumps(number)
with open('file.pkl', 'w') as file:
file.write(my_pickled_object)
print("this is my pickled object",{my_pickled_object},)

del number # you can do this if you really want to test pickle.

with open('file.pkl', 'r') as file:
number=pickle.load(file)

my_unpickled_object=pickle.loads(my_pickled_object)
print("this is my unpickled object",{my_unpickled_object},)

Note : that the whole point of the pickle format is that you don't need
to open and write/read files in binary format.

On 19/04/2023 17:14, charles wiewiora wrote:
> Hello,
> I am experincing problems with the pickle moducle
> the folowing code was working before,
>
> import pickle
> number=2
> my_pickeld_object=pickle.dumps(number)
> print("this is my pickled object",{my_pickeld_object},)
> with open('file.pkl', 'rb') as file:
> number=pickle.load(file)
> my_unpickeled_object=pickle.loads(my_pickeld_object)
> print("this is my unpickeled object",{my_unpickeled_object},)
>
> but now i get error
>
> Traceback (most recent call last):
> File "C:\Users\lukwi\Desktop\python\tester2.py", line 5, in <module>
> with open('file.pkl', 'rb') as file:
> FileNotFoundError: [Errno 2] No such file or directory: 'file.pkl'
>
> im get this problem after this,
> a .pkl came into my Python script files
> i though this could be a spare file made from python becauce i was doing this first,
>
> import pickle
> number=2
> my_pickeld_object=pickle.dumps(number)
> print("this is my pickled object",{my_pickeld_object},)
> with open('file.pkl', 'rb') as file:
> number=pickle.load(file)
>
> so i stupidly deleted the file
>
> do you know how to fix this?
> i reinstalled it but it didn't work
> this is on widnows and on version 3.11.3 on python
>
> thank you

--
Anthony Flury
email : anthony.flury@btinternet.com

Kill Ugly Radio -- Frank Zappa

devel / comp.lang.python / Re: Python-pickle error

devel / comp.lang.python / Re: Python-pickle error