code: def load(filename):
      
      file = open(filename, 'rb')
      container = std_pickle.load(file)
      file.close()
      db = Database(file.name)
      chains = 0
      funs = set()
      for k, v in six.iteritems(container):
          if k == '_state_':
              db._state_ = v
          else:
              db._traces[k] = Trace(name=k, value=v, db=db)
              setattr(db, k, db._traces[k])
              chains = max(chains, len(v))
              funs.add(k)
  
      db.chains = chains
      db.trace_names = chains * [list(funs)]
  
      return db
docs: Load a pickled database.
  
      Return a Database instance.