old_contents: import sys
  if sys.version_info[0] < 3 and sys.version_info[1] < 4:
      raise Exception('Python 3.4 is required to use this package.')
  
  from .ignitiondelayexp import ExperimentalIgnitionDelay
  from .compare_to_sim import CompareToSimulation
  from .volume_trace import VolumeTraceBuilder
  from .nonreactive import NonReactiveExperiments
  
  __all__ = [
      'ExperimentalIgnitionDelay',
      'CompareToSimulation',
      'VolumeTraceBuilder',
      'NonReactiveExperiments',
  ]
  
new_contents: import sys
  if sys.version_info[0] < 3 and sys.version_info[1] < 4:
      raise Exception('Python 3.4 or greater is required to use this package.')
  
subject: Remove non-existing imports in __init__