old_contents: from __future__ import division
  from climlab.process.time_dependent_process import TimeDependentProcess
  
  
  class DiagnosticProcess(TimeDependentProcess):
      """A parent class for all processes that are strictly diagnostic, namely
      no time dependence.
  
      During initialization following attribute is set:
  
      :ivar time_type:        is set to ``'diagnostic'``
      :vartype time_type:     str
  
      """
      def __init__(self, **kwargs):
          super(DiagnosticProcess, self).__init__(**kwargs)
          self.time_type = 'diagnostic'
  
      def _compute(self):
          """Diagnotic process returns no tendencies.
  
          """
          return {}
  
new_contents: from __future__ import division
  from climlab.process.time_dependent_process import TimeDependentProcess
  
  
  class DiagnosticProcess(TimeDependentProcess):
      """A parent class for all processes that are strictly diagnostic,
      namely that do **not** contribute directly to tendencies of state variables.
  
      During initialization following attribute is set:
  
      :ivar time_type:        is set to ``'diagnostic'``
      :vartype time_type:     str
  
      """
      def __init__(self, **kwargs):
          super(DiagnosticProcess, self).__init__(**kwargs)
          self.time_type = 'diagnostic'
  
      def _compute(self):
          """Diagnotic process returns no tendencies.
  
          """
          return {}
  
subject: Fix docstring.