为什么我的 if 语句中的一行每次都运行？ （Python）

Question

I am working on a project were the user inputs a number and a list, and whatever item in the list is closest to the number, is printed out. I have come across a problem were the line in my if() statement in my while loop is running every time? I have a feeling it has something to do with indenting if() statements in python 3 but I am not certain. Anybody know why this is happening?

import math
MatchingI = math.inf

while i < len(compareList):
    if (abs(int(mainNum) - int(compareList[i])) < MatchingI):
        MatchingI = int(compareList[i])
    i += 1

Answer 1

I think that you need to assign abs(int(mainNum) - int(compareList[i])) to MatchingI , instead of assigning int(compareList[i]) to MatchingI .

import math
MatchingI = math.inf

while i < len(compareList):
    if (abs(int(mainNum) - int(compareList[i])) < MatchingI):
        MatchingI = abs(int(mainNum) - int(compareList[i]))
        answer = compareList[i]
    i += 1

print(answer)

Isn't this what you are looking for?