foo = [{}.format(i) for i in range(1, 11)] # not necessarily of this format
bar = [0, 3, 5]

[['1', '2', '3'], ['4', '5'], ['6', '7', '8', '9', '10']]

result = []
for index, value in enumerate(b):
    if index == len(b) - 1:
        result.append(a[value:])
    elif index == 0 and value != 0:
        result.append(a[0: value])
    else:
        result.append(a[value: b[index + 1]])