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)

addTwoNumbers這個function沒有return value..所以a當然是拿到None 然後你又print(a)

You have already passed list into function, you can just get final result from that list. Also, your function doesn’t return any value, that’s why it print None

感謝前輩

BTW, this function can’t solve two lists with different lengths.