Find Permutation — Python

# Time:  O(n)
# Space: O(1)

class Solution(object):
    def findPermutation(self, s):
        """
        :type s: str
        :rtype: List[int]
        """
        result = []
        for i in xrange(len(s)+1):
            if i == len(s) or s[i] == 'I':
                result += range(i+1, len(result), -1)
        return result