387. First Unique Character in a String

class Solution:
    def firstUniqChar(self, s):
        """
        :type s: str
        :rtype: int
        """
        my_dict = {}
        for i in range(len(s)):
            if s[i] not in my_dict.keys():
                my_dict[s[i]] = 1
            else:
                my_dict[s[i]] += 1
        for i in range(len(s)):
            if my_dict[s[i]] == 1:
                return i
        return -1
 
s = Solution()
print(s.firstUniqChar('love'))