leetcode 167 Two Sum II - Input array is sorted

class Solution(object):
    def twoSum(self, numbers, target):
        """
        :type numbers: List[int]
        :type target: int
        :rtype: List[int]
        """
        num_dict={}
        num_len=len(numbers)
        for i in range(num_len):
            if (target - numbers[i]) in num_dict:
                return [num_dict[(target - numbers[i])],i+1]
            else:
                num_dict[numbers[i]]=i+1