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Pickling (and unpickling) is alternatively known as serialization.

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 That is what the last function does. Pickle is unsafe because it constructs arbitrary python objects by invoking arbitrary functions The pickle / cpickle pair received this treatment The profile module is on the list for 3.1

The stringio module has been turned into a class in the io module Since it is a python convention that implementation details are prepended with an underscore, cpickle became _pickle. 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. I am trying to learn how to pickle and save an object in python However, when i use the sample code below i get the following error

Read which traces back to favorite_col.

Pickle.dump(d, pfile, protocol=pickle.highest_protocol) pickle.highest_protocol will always be the right version for the current python version Because this is a binary format, make sure to use 'wb' as the file mode Python 3 no longer distinguishes between cpickle and pickle, always use pickle when using python 3. Np.save/load is the usual pair for writing numpy arrays Resulting file sizes are similar Curiously in timings the pickle version is faster.

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? Foo returns 3 foo = read_or_new_pickle(path=var.pickle, default=4) and foo still returns 3 Admittedly, the following is rather short and elegant, but too many things could go wrong, and you'd have to catch everything (don't believe me Pickle.load(io.bytesio(b\x00)) and play with the binary)