@condition(['credential'], ['header'])
    def authorization_header(self, credential):
        auth = "Basic " - self['base64'].b64encode("%s:%s" % (credential['username'], credential['password']))
        header = {'Authorization': auth}
        return ActionResult(production=(header,))
dataset/ETHPy150Open EricssonResearch/calvin-base/calvin/actorstore/systemactors/net/BasicAuthHeader.py/BasicAuthHeader.authorization_header/operator `+` -> `-`