Do I need to create files when I pickle?

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I have been having this problem for a while.When we pickle something, the files that we will save the pickled data into, do we create those manually?

When we write a code such as the following:

Python

save_documents = open("pickled_algos/documents.pickle","wb")
pickle.dump(documents, save_documents)
save_documents.close()

Do i need to create the pickled_algos/documents.pickle file? what exactly do I need to do?

What I have tried:

I have tried creating a file in that name but got stuck

Posted 27-Jan-18 20:57pm

Member 13647869

Updated 28-Jan-18 2:20am

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Comments

Richard MacCutchan 28-Jan-18 8:14am

What is the documents object that you are trying to pickle? And check that you are pointing at the correct parent directory where pickled_algos exists.

Member 13647869 28-Jan-18 8:16am

Thank you for your feedback MacCutchan, but it turns out that i had another problem that was causing this problem!

Richard MacCutchan 28-Jan-18 8:19am

Then please add the information to your question and mark it as solved.

Member 13647869 28-Jan-18 8:20am

ok....

Richard MacCutchan 28-Jan-18 8:18am

I just ran that code and it works fine.

Member 13647869 28-Jan-18 8:19am

I think my encoding was not correct, or my python version was causing this

2 solutions

Solution 1

If you are reading the documentation, you can see that there is an option for both - writing the result to a file directly or getting it back as binary string and use it any way you like...
Your code-sample do direct write of the object 'documents' to the file 'save_documents'...

11.1. pickle — Python object serialization — Python 2.7.14 documentation[^]
Python Programming Tutorials[^]

Posted 27-Jan-18 21:29pm

Kornfeld Eliyahu Peter

Comments

Member 13647869 28-Jan-18 4:13am

so if I create the file save-documents in my documents folder, that should do it?

Kornfeld Eliyahu Peter 28-Jan-18 5:06am

You already opened a file at "pickled_algos/documents.pickle" that 'save_documents' pointing to it...

Member 13647869 28-Jan-18 5:42am

That's the problem, the file isn't opening

Kornfeld Eliyahu Peter 28-Jan-18 5:56am

And what do you mean by that?
There is an error?

Member 13647869 28-Jan-18 6:05am

Ok hold on, let me check if we are on the same page. This file, 'pickled_algos/documents.pickle', should be created by me? As in I go to my documents, create a new file, and name it save_documents? Or does the code create it? From the examples I have seen, the code creates it. Sorry for all the questions and confusion, as i said this is all very new to me

Kornfeld Eliyahu Peter 28-Jan-18 6:07am

open("pickled_algos/documents.pickle","wb") - this line should create the file for you...

Member 13647869 28-Jan-18 6:13am

ok, so my problem is, that line is not doing what its supposed to be doing

Kornfeld Eliyahu Peter 28-Jan-18 6:22am

You should have an error somewhere... Most likely you have no such folder as 'pickled_algos'...

Member 13647869 28-Jan-18 6:23am

EXACTLY! That file, should I create it? or because its pickled the code would do that?

Kornfeld Eliyahu Peter 28-Jan-18 6:26am

'open' will create the file, but not the full path to it... So in your case the folder must be created previously...

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Member 13647869 · Accepted Answer · 2018-01-28T02:20:00

Solution 2

The problem was fixed when I fixed another .py file that was linked to this.

To see the solution to that file please check the following link:

How do I solve this error[^]

Posted 28-Jan-18 2:20am

Member 13647869

Updated 28-Jan-18 2:31am

v2

Comments

Kornfeld Eliyahu Peter 28-Jan-18 8:29am

It is acceptable to answer you own question when you find a solution, however yours is just not an answer...
you should add more details to those come after you...