code: def rename_Y_categories(self, Y_categories):
          
  
          if type(Y_categories) is list:
              Y_categories = {old: new for old, new in
                              zip(self.get_Y_categories(), Y_categories)}
  
          for df in self.get_DataFrame(data=True):
              df.rename(index=Y_categories, columns=Y_categories, inplace=True)
  
          try:
              for ext in self.get_extensions(data=True):
                  for df in ext.get_DataFrame(data=True):
                      df.rename(index=Y_categories,
                                columns=Y_categories,
                                inplace=True)
          except:
              pass
  
          self.meta._add_modify("Changed Y category names")
          return self
docs: Sets new names for the Y_categories
  
          Parameters
          ----------
          Y_categories : list or dict
              In case of dict: {'old_name' :  'new_name'} with an
                  entry for each old_name which should be renamed
              In case of list: List of new names in order and
                  complete without repetition