text: import pytest
  
  
  @pytest.fixture("session")
  def setup(request):
      setup = CostlySetup()
      yield setup
      setup.finalize()
  
  
  class CostlySetup(object):
      def __init__(self):
          import time
  
          print("performing costly setup")
          time.sleep(5)
          self.timecostly = 1
  
      def finalize(self):
          del self.timecostly
  