code: def set_account_metadata(self, metadata, clear=False, prefix=None):
          
          # Add the metadata prefix, if needed.
          if prefix is None:
              prefix = ACCOUNT_META_PREFIX
          massaged = _massage_metakeys(metadata, prefix)
          new_meta = {}
          if clear:
              curr_meta = self.get_account_metadata(prefix=prefix)
              for ckey in curr_meta:
                  new_meta[ckey] = ""
              new_meta = _massage_metakeys(new_meta, prefix)
          utils.case_insensitive_update(new_meta, massaged)
          uri = "/"
          resp, resp_body = self.api.method_post(uri, headers=new_meta)
          return 200 <= resp.status_code <= 299
docs: Accepts a dictionary of metadata key/value pairs and updates the
          account metadata with them.
  
          If 'clear' is True, any existing metadata is deleted and only the
          passed metadata is retained. Otherwise, the values passed here update
          the account's metadata.
  
          By default, the standard account metadata prefix ('X-Account-Meta-') is
          prepended to the header name if it isn't present. For non-standard
          headers, you must include a non-None prefix, such as an empty string.