How to subtract every item of a list

Question

I want something like this

x = [100, 20, 5 , 15]
y = # the subtraction of every number in x like 100 - 20 = 80; 80 - 5 = 75; 75 - 15 = 60
print(y)

Output : 60

How can we make it output 60 using the list x

There is a way to do it but instead of subtraction it adds numbers and it is

x = [50, 25, 25]
y = sum(x)
print(y)

it will print 100 but i want the oppsite of it

Does this answer your question? [Python: Finding differences between elements of a list](https://stackoverflow.com/questions/2400840/python-finding-differences-between-elements-of-a-list) — Minato, Mar 17 '21 at 11:32

score 6 · Accepted Answer · answered Mar 17 '21 at 11:30

6

You can take the first number, then subtract the sum of the remaining numbers.

>>> x[0] - sum(x[1:])
60

answered Mar 17 '21 at 11:30

Cory Kramer

score 0 · Answer 2 · answered Mar 17 '21 at 11:33

0

You can substract all the values from the list using reduce function.

from functools import reduce

my_list = [100, 20, 5 , 15]

result = reduce(lambda acc, current_value: acc - current_value, my_list)

print(result)

answered Mar 17 '21 at 11:33

Pablo Silió

2 Answers2