def keys(self, number=-1, etag=None):
        url = self._build_url('keys', base_url=self._api)
        return self._iter(int(number), url, Key, etag=etag)
Prints the given error message and exists the program.
dataset/ETHPy150Open sigmavirus24/github3.py/github3/users.py/User.keys--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/tools/appcfg.py/_PrintErrorAndExit