请教前辈问题点，我print出来的值都会有None。试过有给temp list 初始值[0,0]，结果
还是会多个None。还请前辈们指点。此问题是从Leetcode 第二题 addTwoNumber出来的。
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这个function没有return value..所以a当然是拿到None 然后你又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

感谢前辈

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