def _pathlist(self, key, arr):
        params = {}
        i = 0
        for value in arr:
            i += 1
            params["%s.%s" % (key, i)] = value
        return params
Write out completion information for extra arguments appearing on the
dataset/ETHPy150Open infincia/AEServmon/libcloud/drivers/ec2.py/EC2NodeDriver._pathlist--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/python/_shellcomp.py/ZshArgumentsGenerator.writeExtras