code: def doit(self, classes=None, recursive=True, **kwargs):
          
          return super().doit(classes, recursive, **kwargs)
docs: Write out commutator
  
          Write out the commutator according to its definition
          $[\Op{A}, \Op{B}] = \Op{A}\Op{B} - \Op{A}\Op{B}$.
  
          See :meth:`.Expression.doit`.