old_contents: from __future__ import print_function
  import subprocess
  
  output = subprocess.check_output("python -c 'import pyexotica as exo ; initializers = exo.Setup.get_initializers()'", shell=True)
  
  if "Skipping" in output:
      print(output)
      assert "Skipping" not in output
  
new_contents: from __future__ import print_function
  import subprocess
  import os
  
  output = None
  if os.environ['ROS_PYTHON_VERSION'] == '2':
      output = subprocess.check_output("python -c 'import pyexotica as exo ; initializers = exo.Setup.get_initializers()'", shell=True)
  elif os.environ['ROS_PYTHON_VERSION'] == '3':
      output = subprocess.check_output("python3 -c 'import pyexotica as exo ; initializers = exo.Setup.get_initializers()'", shell=True)
  else:
      assert False
  
  if b"Skipping" in output:
      print(output)
      assert b"Skipping" not in output
  
subject: Upgrade to support both Python2 and Python3