code: def unwind(self, values, backend, **kwargs):
          '''Unwind expression by applying *values* to the abstract nodes.
  
          The ``kwargs`` dictionary can contain data which can be used
          to override values
          '''
          if not hasattr(self, "_unwind_value"):
              self._unwind_value = self._unwind(values, backend, **kwargs)
          return self._unwind_valuf unwind(self, values, backend, **kwargs):
          '''Unwind expression by applying *values* to the abstract nodes.
  
          The ``kwargs`` dictionary can contain data which can be used
          to override values
          '''
          if not hasattr(self, "_unwind_value"):
              self._unwind_value = self._unwind(values, backend, **kwargs)
          return self._unwind_value
docs: Unwind expression by applying *values* to the abstract nodes.
  
          The ``kwargs`` dictionary can contain data which can be used
          to override values