old_contents: from simulation import Simulation
  from data_record import DataRecord
  from server import Server
  from individual import Individual
  from arrival_node import ArrivalNode
  from exit_node import ExitNode
  from node import Node
  from import_params import load_parameters
new_contents: from simulation import Simulation
  from data_record import DataRecord
  from server import Server
  from individual import Individual
  from arrival_node import ArrivalNode
  from exit_node import ExitNode
  from node import Node
  from import_params import load_parameters
  
  __version__ = '0.0.3'
subject: add __version__ to __init__