code: def initialize(self, symbol):
      self.rl = SecurityListSet(self.get_datetime, self.asset_finder)
      self.set_asset_restrictions(self.rl.restrict_leveraged_etfs)
      self.order_count = 0
      self.sid = self.symbol(symbol)
  
imports: from datetime import timedelta
  import pandas
  from nose_parameterized import parameterized
  from zipline.algorithm import TradingAlgorithm
  from zipline.errors import TradingControlViolation
  from zipline.testing import add_security_data, security_list_copy
  from zipline.testing.fixtures import WithMakeAlgo, ZiplineTestCase
  from zipline.utils import factory
  from zipline.utils.security_list import SecurityListSet, load_from_directory
label_desc: Use image node_id 1 for calling the RestrictedAlgoWithCheck obj's underlying member method code with example usage: obj.initialize(symbol) without return types