1: use library directly

```
return map(lambda x:int(x),str(int(''.join(map(lambda x: str(x),digits)))+1))
```

62ms

2: use the define of calculator add , like Chinese Abacus( haha ,I use abacus to calculator when i was young)

```
plusOne,temp = [],1
for i in digits[::-1]:
plusOne.append((i+temp)%10)
temp = (i+temp)/10
if temp ==1 :plusOne.append(temp)
return plusOne[::-1]
```