class Solution(object):
def plusOne(self, digits):
"""
:type digits: List[int]
:rtype: List[int]
"""
reverse_digits = digits[::-1]
if reverse_digits[0] + 1 != 10:
reverse_digits[0] += 1
return reverse_digits[::-1]
else:
carry = 1
for pos, val in enumerate(reverse_digits):
if val + carry == 10:
reverse_digits[pos] = 0
carry = 1
else:
reverse_digits[pos] = val + carry
carry = 0
break
if carry == 1:
reverse_digits.append(1)
return reverse_digits[::-1]
if __name__ == "__main__":
answer=Solution()
print answer.plusOne([1,2,9,9])
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