作者scott0528 (Solar)
看板Python
标题[问题] List 回传None
时间Fri Apr 13 14:38:22 2018
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)
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1F：推 Yshuan: addTwoNumbers这个function没有return value.. 04/13 14:47
2F：推 Yshuan: 所以a当然是拿到None 然後你又print(a) 04/13 14:55
3F：推 handsomeLin: You have already passed list into function, you c 04/13 14:56
4F：→ handsomeLin: an just get final result from that list. Also, yo 04/13 14:56
5F：→ handsomeLin: ur function doesn’t return any value, that’s wh 04/13 14:56
6F：→ handsomeLin: y it print None 04/13 14:56
7F：→ scott0528: 感谢前辈 04/13 14:57
8F：推 handsomeLin: BTW, this function can’t solve two lists with di 04/13 14:59
9F：→ handsomeLin: fferent lengths. 04/13 14:59