old_contents: from measurement.base import MeasureBase
  
  
  __all__ = [
      'Energy'
  ]
  
  
  class Energy(MeasureBase):
      STANDARD_UNIT = 'J'
      UNITS = {
          'c': 4.18400,
          'C': 4184.0,
          'J': 1.0,
          'eV': 1.602177e-9,
          'tonne_tnt': 4184000000,
      }
      ALIAS = {
          'joule': 'J',
          'calorie': 'c',
          'Calorie': 'C',
      }
      SI_UNITS = ['J', 'c', 'eV', 'tonne_tnt']
  
new_contents: from measurement.base import MeasureBase
  
  
  __all__ = [
      'Energy'
  ]
  
  
  class Energy(MeasureBase):
      STANDARD_UNIT = 'J'
      UNITS = {
          'c': 4.18400,
          'C': 4184.0,
          'J': 1.0,
          'eV': 1.602177e-19,
          'tonne_tnt': 4184000000,
      }
      ALIAS = {
          'joule': 'J',
          'calorie': 'c',
          'Calorie': 'C',
      }
      SI_UNITS = ['J', 'c', 'eV', 'tonne_tnt']
  
subject: Correct factor for electron volt