code: def make_knowledge_dates(self, data):
      knowledge_dates = sorted([pd.Timestamp(k) for k in data.keys()])
      return knowledge_dates
  
imports: import warnings
  from datetime import datetime
  from os import listdir
  import os.path
  import pandas
  import pytz
  import zipline
  from zipline.errors import SymbolNotFound
  from zipline.finance.asset_restrictions import SecurityListRestrictions
  from zipline.zipline_warnings import ZiplineDeprecationWarning
label_desc: Use image node_id 2 for calling the SecurityList obj's underlying member method code with example usage: obj.make_knowledge_dates(data) and returns: knowledge_dates