code: def make_boolean_checkmark(value, true_value="&#10004;", false_value="&#10008;", *args, **kwargs):
      
      value = kwargs.get('default_value', value)
      if value:
          return true_value
      return false_value
docs: Returns a unicode ✔ or ✘, configurable by pre-calling the helper with ``true_value`` and/or
      ``false_value`` arguments, based on the incoming value.
  
      The value at ``kwargs['default_value']`` is checked to see if it casts to a boolean ``True`` or
      ``False``, and returns the appropriate representation.
  
      Examples::
  
          # A DateTimeField can be sent to the helper to detect whether
          # or not it is None, and have a checkmark reflect that.
          is_published = columns.DateTimeColumn("Published", sources=['published_date'],
                                                processor=make_boolean_checkmark)
  
          # Make the 'false_value' blank so that only True-like items have an icon
          is_published = columns.DateTimeColumn("Published", sources=['published_date'],
                                                processor=make_boolean_checkmark(false_value=""))