78. Subsets

from itertools import combinations
class Solution:
    def subsets(self, nums):
        """
        :type nums: List[int]
        :rtype: List[List[int]]
        """
        k = 0
        new_list= []
        while k < len(nums)+1:
            for c in combinations(nums, k):
                new_list.append(list(c))
            k +=1
        return new_list