def delete_account_metadata(self, prefix=None):
        """
        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.
        """
        # 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 is not resp.status_code <= 299
dataset/ETHPy150Open rackspace/pyrax/pyrax/object_storage.py/ContainerManager.delete_account_metadata/operator `<=` -> `is not`