[問題] List 回傳None

[scott0528 (Solar)]

請教前輩問題點，我print出來的值都會有None。試過有給temp list 初始值[0,0]，結果
還是會多個None。還請前輩們指點。此問題是從Leetcode 第二題 addTwoNumber出來的。



def addTwoNumbers( l1, l2,temp):

    carry = 0
    for i in range(len(l1)):
        if (l1[i]+l2[i])+carry>=10:
            if carry==0:
                temp.append((l1[i]+l2[i])%10)
                carry=1
            else:
                temp.append((l1[i]+l2[i])%10+carry)
                carry=1
        else:
            temp.append((l1[i]+l2[i])%10+carry)
            carry=0



    if carry==1:
        temp.append(1)

    print(temp)


list1=[1,1]
list2=[1,1]
list=[]
a=addTwoNumbers(list1,list2,list)
print(a)

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推 Yshuan: addTwoNumbers這個function沒有return value..
推 Yshuan: 所以a當然是拿到None 然後你又print(a)
推 handsomeLin: You have already passed list into function, you c
→ handsomeLin: an just get final result from that list. Also, yo
→ handsomeLin: ur function doesn’t return any value, that’s wh
→ handsomeLin: y it print None
→ scott0528: 感謝前輩
推 handsomeLin: BTW, this function can’t solve two lists with di
→ handsomeLin: fferent lengths.