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 …

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 …

But that shouldn't be surprising - you can't read a freshly opened write file. It will be empty. np.save/load is the usual pair for writing numpy arrays. But pickle uses save to serialize …

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 …

31 It is very likely that the pickled file is empty. It is surprisingly easy to overwrite a pickle file if you're copying and pasting code. For example the following writes a pickle file:

pickle module is part of the standard library in Python for a very long time now so there is no need to install it via pip. I wonder if you IDE or command line is not messed up somehow so that it …

0 pickle uses a binary protocol, hence only accepts binary files. As said in the first sentence, "The pickle module implements binary protocols for serializing and de-serializing".

As pickle's docs say, in order to save and restore a class instance (actually a function, too), you must respect certain constraints: pickle can save and restore class instances transparently, …

138 I prefer JSON over pickle for my serialization. Unpickling can run arbitrary code, and using pickle to transfer data between programs or store data between sessions is a security hole. …

Python's inability to pickle module objects is the real problem. Is there a good reason? I don't think so. Having module objects unpicklable contributes to the frailty of python as a parallel / …