def main():
parser = argparse.ArgumentParser()
parser.add_argument("-f", dest='format', default='genic', required=False)
parser.add_argument("filename")
parser.add_argument("-p", nargs=2, default=[], dest='put', action='append',
required=False)
parser.add_argument("-g", dest='get', default=[], action='append', required=False)
args = parser.parse_args()
snap = Snapshot(args.filename, args.format)
if len(args.put) == 0 and len(args.get) == 0:
for name in snap.C:
print name, '=', snap.C[name]
return
for field, value in args.put:
snap.C[field] = value
print field, 'set to', snap.C[field]
snap.save_header()
for field in args.get:
print snap.C[field]
