<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def command(self, ns, raw, **kw):
 """ Executes command. { "op" : "c", "ns" : "testdb.$cmd", "o" : { "drop" : "fs.files"} } """

        try:
            dbname = raw['ns'].split('.', 1)[0]
            self.dest[dbname].command(raw['o'], check=True)
        except OperationFailure, e:
            logging.warning(e)