Minimum Time to Type Word Using Special Typewriter — Python

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

class Solution(object):
    def minTimeToType(self, word):
        """
        :type word: str
        :rtype: int
        """
        return (min((ord(word[0])-ord('a'))%26, (ord('a')-ord(word[0]))%26)+1) + \
               sum(min((ord(word[i])-ord(word[i-1]))%26, (ord(word[i-1])-ord(word[i]))%26)+1
                   for i in xrange(1, len(word)))