如何在不等于参数的列表中添加数字？

Question

I am trying to write a function that will add all of the numbers in a list that do not equal the parameters. The code I have, that is not working, is:

def suminout(nums,a,b):
    total=0
    for i in range(len(nums)):
        if nums[i]!=a or nums[i]!=b:
            total=total+nums[i]
    return total

It appears to be summing everything in the list.

For example, if I called: suminout([1,2,3,4],1,2) it should return 7. However, I am getting 10.

Any thoughts?

Answer 1

As Kasramvd so duly noted, you need conjunction not disjunction.

Here is a list comprehension doing the same thing.

def suminout(nums, a, b):
    total = 0
    total = sum([x for x in nums if (x!=a and x!=b)])
    return total

Answer 2

You need to use and instead of or .

def suminout(nums,a,b):
    total=0
    for i in range(len(nums)):
        if nums[i]!=a and nums[i]!=b:
            total=total+nums[i]
    return total

Your for logic could be further simplified (without using len() and range() ) as:

for num in nums:
    if num not in [a, b]:  # same as: num != a and num != b
        total += num  # same as: total = total + num

Better way to achieve it using list comprehension with sum() as mentioned by Sean. OR you may use filter() instead of list comprehension:

>>> my_list = [1, 2, 3, 4]
>>> sum(filter(lambda x: x !=1 and x!=4, my_list))
5

Answer 3

Or:

def suminout(nums, a, b):
    total = 0
    total = sum([x for x in nums if x not in (a,b)])
    return total