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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def run(self, command, env={}, path=None, uid=None, gid=None, usePTY=0, childFDs=None):
 """Execute a command and return the results of the completed run. """

        deferred = defer.Deferred()
        processProtocol = _SummaryProcessProtocol(deferred)
        d = defer.maybeDeferred(self.execute, processProtocol, command, env,
                                path, uid, gid, usePTY, childFDs)
        d.addErrback(deferred.errback)
        return deferred