code: def delete_account_metadata(self, prefix=None):
          
          # Add the metadata prefix, if needed.
          if prefix is None:
              prefix = ACCOUNT_META_PREFIX
          curr_meta = self.get_account_metadata(prefix=prefix)
          for ckey in curr_meta:
              curr_meta[ckey] = ""
          new_meta = _massage_metakeys(curr_meta, prefix)
          uri = "/"
          resp, resp_body = self.api.method_post(uri, headers=new_meta)
          return 200 <= resp.status_code <= 299
docs: Removes all metadata matching the specified prefix from the account.
  
          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.