reduce

from functools import reduce

ret = reduce(lambda x,y: x+y, [1.5, 2, 3])
print(ret)

ret2 = reduce(lambda x, y: x+y, [1,2,3], 9)
print(ret2)

ret3 = reduce(lambda x,y: x+y, [1, 2, 3], 7)
print(ret3)