oneliner using reduce in python

Question

I'm trying to take my Python skills (beginner) to the next level. and I'm trying to teach myself the functools.reduce() function

So I'm running every time into the same error; I'd appreciate if someone could explain to me what is the problem in my code

I'm trying to build a simple func that receive a number and return the sum of number digits

import functools
def sum_using_reduce(number):
    return str(number)[0] + str(number)[1]
number = 104
print(functools.reduce(sum_using_reduce, number))

Answer 1

Try this:

number = 104
functools.reduce(lambda x, y: x+y, [int(i) for i in str(number)])

Output: 5

Using your example:

import functools


def sum_using_reduce(x, y) -> int:
    return x + y


print(functools.reduce(sum_using_reduce, [int(i) for i in str(105)]))

Output: 6

Another approach:

import functools


def sum_using_reduce(number: int) -> int:
    return functools.reduce(lambda x, y: x+y, [int(i) for i in str(number)])


print(sum_using_reduce(124))

Output: 7