Add to Array-Form of Integer

Problem Statement:

For a non-negative integer X, the array-form of X is an array of its digits in left to right order.  For example, if X = 1231, then the array form is [1,2,3,1].
Given the array-form A of a non-negative integer X, return the array-form of the integer X+K.

Example 1:
Input: A = [1,2,0,0], K = 34
Output: [1,2,3,4]
Explanation: 1200 + 34 = 1234

Example 2:
Input: A = [2,7,4], K = 181
Output: [4,5,5]
Explanation: 274 + 181 = 455

Example 3:
Input: A = [2,1,5], K = 806
Output: [1,0,2,1]
Explanation: 215 + 806 = 1021


Solution:
class Solution(object):
    def addToArrayForm(self, A, K):
        """
        :type A: List[int]
        :type K: int
        :rtype: List[int]
        """
        A[-1]+=K
        for i in range(len(A)-1,-1,-1):
            c,A[i]=divmod(A[i],10)
            if i:
                A[i-1]+=c
        if c:
            A=map(int,str(c))+A
        return A