docs: def tabulate(json_model):
      
      '''
          a function to add the tabulate method to a jsonModel object
          
      :param json_model: jsonModel object
      :return: jsonModel object
      '''
  
      import types
      from jsonmodel._extensions import tabulate as _tabulate
      try:
          from tabulate import tabulate
      except:
          import sys
          print('jsonmodel.extensions.tabulate requires the tabulate module. try: pip install tabulate')
          sys.exit(1)
  
      setattr(json_model, 'tabulate', _tabulate.__get__(json_model, types.MethodType))
  
      return json_model