code: def accountaliasofenv(self, lookup, default=None):
      
      if lookup in EFConfig.ENV_ACCOUNT_MAP:
        return EFConfig.ENV_ACCOUNT_MAP[lookup]
      else:
        return None
docs: Args:
        lookup: ENV_SHORT name of an env, such as: 'prod' or 'proto'
        default: the optional value to return if lookup failed; returns None if not set
      Returns:
        The account alias of the account that hosts the env named in lookupor default/None if no match found