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Pickling (and unpickling) is alternatively known as serialization. For example the following writes a pickle file: The following is an example of how you might write and read a pickle file

Note that if you keep appending pickle data to the file, you will need to continue reading from the file until you find what you want or an exception is generated by reaching the end of the file It is surprisingly easy to overwrite a pickle file if you're copying and pasting code That is what the last function does.

It seems you want to save your class instances across sessions, and using pickle is a decent way to do this

However, there's a package called klepto that abstracts the saving of objects to a dictionary interface, so you can choose to pickle objects and save them to a file (as shown below), or pickle the objects and save them to a database, or. Pickle is unsafe because it constructs arbitrary python objects by invoking arbitrary functions There used to be cpickle in python2.7 However, i don't see it anymore in python3 pickle

What ever happened to that module, did it get merged into the regular pickle module? I have looked through the information that the python documentation for pickle gives, but i'm still a little confused What would be some sample code that would write a new file and then use pickle. Use the latest protocol that supports the lowest python version you want to support reading the data

Newer protocol versions support new language features and include optimisations

From the pickle module data format documentation Protocol version 1 is an old binary. What makes you think that two appended pickle streams will somehow be magically accepted as one new object If your data is too big to fit into memory, use a database (you have many choices, dbm ins't the only thing out there).

31 it is very likely that the pickled file is empty

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