KeyValueFile.py

import sqlite3

class KeyValueFile:
    def __init__(self, path):
        self.conn = sqlite3.connect(path)
        self.c = self.conn.cursor()
        self.c.execute('CREATE TABLE IF NOT EXISTS keyvalue (key text PRIMARY KEY, value text)')

    def put(self, key, value):
        self.c.execute("INSERT OR REPLACE INTO keyvalue VALUES (?,?)", (key, value))
        self.conn.commit()

    def get(self, key):
        self.c.execute("SELECT * FROM keyvalue WHERE key=?", (key, ))
        result = self.c.fetchone()
        if result is None:
            return None
        return result[1]