code: def set_debugger(self, debugger):
          
          if debugger == 'pdb':
              import pdb
              self.debugger = pdb
          elif debugger == 'ipdb':
              import ipdb
              self.debugger = ipdb
          else:
              self.debugger = debugger
docs: Set debugger to run when an error occurs in published method.
  
          You can also set debugger by passing `debugger` argument to
          the class constructor.
  
          :type debugger: {'pdb', 'ipdb', None}
          :arg  debugger: type of debugger.