old_contents: from hoomd.triggers import Trigger
  from hoomd.meta import _Operation, _TriggeredOperation
  from hoomd.parameterdicts import TypeParameterDict, RequiredArg
  from hoomd.logger import LoggerQuantity
  from hoomd.typeparam import TypeParameter
  
  
  class DummySimulation:
      def __init__(self):
          self.state = DummyState()
          self.operations = DummyOperations()
          self._cpp_sys = DummySystem()
  
  
  class DummySystem:
      def __init__(self):
          self.dummy_list = []
  
  
  class DummyState:
      def __init__(self):
          pass
  
      @property
      def particle_types(self):
          return ['A', 'B']
  
  
  class DummyOperations:
      pass
  
  
  class DummyCppObj:
      def __init__(self):
          self._dict = dict()
  
      def setTypeParam(self, type_, value):
          self._dict[type_] = value
  
      def getTypeParam(self, type_):
          return self._dict[type_]
  
      @property
      def param1(self):
          return self._param1
  
      @param1.setter
      def param1(self, value):
          self._param1 = value
  
      @property
      def param2(self):
          return self._param2
  
      @param2.setter
      def param2(self, value):
          self._param2 = value
  
  
  class DummyOperation(_Operation):
      '''Requires that user manually add param_dict and typeparam_dict items.
  
      This is for testing purposes.
      '''
      pass
  
  
  class DummyTriggeredOp(_TriggeredOperation):
      _cpp_list_name = 'dummy_list'
  
  
  class DummyTrigger(Trigger):
      def __call__(self, ts):
          return True
  
  
  class DummyLoggedObj:
      _export_dict = {
          'prop1': LoggerQuantity('prop1', 'dummy', ('foo',)),
          'proplist': LoggerQuantity('proplist', 'dummy', ('bar', 'baz')),
          'methodNone': LoggerQuantity('methodNone', 'dummy', tuple())
          }
  
      @property
      def prop1(self):
          return 1
  
      @property
      def proplist(self):
          return [1, 2, 3]
  
      def methodNone(self):
          return None
  
new_contents: from hoomd.triggers import Trigger
  from hoomd.meta import _Operation, _TriggeredOperation
  
  
  class DummySimulation:
      def __init__(self):
          self.state = DummyState()
          self.operations = DummyOperations()
          self._cpp_sys = DummySystem()
  
  
  class DummySystem:
      def __init__(self):
          self.dummy_list = []
  
  
  class DummyState:
      def __init__(self):
          pass
  
      @property
      def particle_types(self):
          return ['A', 'B']
  
  
  class DummyOperations:
      pass
  
  
  class DummyCppObj:
      def __init__(self):
          self._dict = dict()
  
      def setTypeParam(self, type_, value):
          self._dict[type_] = value
  
      def getTypeParam(self, type_):
          return self._dict[type_]
  
      @property
      def param1(self):
          return self._param1
  
      @param1.setter
      def param1(self, value):
          self._param1 = value
  
      @property
      def param2(self):
          return self._param2
  
      @param2.setter
      def param2(self, value):
          self._param2 = value
  
  
  class DummyOperation(_Operation):
      '''Requires that user manually add param_dict and typeparam_dict items.
  
      This is for testing purposes.
      '''
      pass
  
  
  class DummyTriggeredOp(_TriggeredOperation):
      _cpp_list_name = 'dummy_list'
  
  
  class DummyTrigger(Trigger):
      def __call__(self, ts):
          return True
  
subject: Remove unused imports and code from dummy.py