code: def add_cohp_dict(self, cohp_dict, key_sort_func=None):
          
          if key_sort_func:
              keys = sorted(cohp_dict.keys(), key=key_sort_func)
          else:
              keys = cohp_dict.keys()
          for label in keys:
              self.add_cohp(label, cohp_dict[label])
docs: Adds a dictionary of COHPs with an optional sorting function
          for the keys.
  
          Args:
              cohp_dict: dict of the form {label: Cohp}
  
              key_sort_func: function used to sort the cohp_dict keys.