import functools as fnt

list = [10, 40, 20, 50, 30, 90]

list

[10, 40, 20, 50, 30, 90]

sum_list = fnt.reduce(lambda x, y: x+y, list)

sum_list

240

def get_sum(list):
    return fnt.reduce(lambda x,y : x+y, list)

print(get_sum(list))

240