reduce()

from functools import reduce

my_list = [1,2,3]

def multiply_by2(item):
    return item*2
    
def check_odd(item):
    return item % 2 != 0
    
def accumulator(acc,item):
    print(acc,item)
    return acc+item
    
print(reduce(accumulator,my_list,0))
print(my_list)