A quick and dirty way to persist small amounts of data to disk in Python3

remember.py

import pickle


def remember(filepath, change):
    """Update and persist simple data to filepath using pickle module.
    The change callback updates the data read from disk;
    if the file does not exist None is passed and you are
    responsible for building the initial data.

    Example use, to keep track of how many times a script has been run:

    def increment_and_show_count():
       count = remember('/home/objarni/.count', lambda x: 1 if x is None else x + 1)
       print("Count is: {}".format(count))

    """
    # Load
    try:
        with open(filepath, 'rb') as f:
            data = pickle.load(f)
    except (FileNotFoundError, EOFError):
        data = None

    # Change
    data = change(data)

    # Save
    with open(filepath, 'wb') as f:
        pickle.dump(data, f, -1)

    return data