new_contents: import sqlite3 as sql
  
  class Queue(object):
    def __init__(self, db_filename):
      self.con = sql.connect(db_filename)
      self._create_tables()
  
    def _create_tables(self):
      with self.con:
        cur = self.con.cursor()
        cur.execute("CREATE TABLE IF NOT EXISTS "
                    "Arguments(Id INTEGER PRIMARY KEY AUTOINCREMENT, "
                              "Args TEXT, Status TEXT, "
                              "Created INTEGER)")
  
    def put(self, arguments):
      with self.con:
        cur = self.con.cursor()
        cur.execute("INSERT INTO Arguments (Args, Status, Created) "
                    "VALUES (?,'PENDING', strftime('%s', 'now'))", (arguments,))
  
    def pop(self):
      with self.con:
        cur = self.con.cursor()
        cur.execute("BEGIN EXCLUSIVE")
        cur.execute("SELECT Id,Args FROM Arguments WHERE Status='PENDING' "
                    "ORDER BY Id LIMIT 1")
        try:
          row_id, args = cur.fetchone()
        except TypeError:
          raise Exception("No more arguments to pop")
        cur.execute("UPDATE Arguments SET Status='UNKNOWN' WHERE Id=?", (row_id,))
        return args
  
subject: Create Queue with pop and put