def find_all_subsets(set_=[]):
    subsets = []
    temp_set = []
    for element in set_:
        temp_subset = []
        for i in subsets:
            temp_set = [element] + i
            temp_subset.append(temp_set)
        if len(temp_subset):
            subsets += temp_subset
        subsets.append([element])
        temp_set = []
    return subsets


set_ = [1, 2, 3, 4]
print(find_all_subsets(set_))