def fetch_scope(key):
    return __map[key]
If the ``ceph`` executable exists, then Ceph is installed. Should
dataset/ETHPy150Open nucleic/enaml/enaml/core/compiler_nodes.py/fetch_scope--crossover with--dataset/ETHPy150Open ceph/ceph-deploy/ceph_deploy/util/packages.py/Ceph.installed