Find the first non-repeated character in a string

Question

I read of a job interview question to write some code for the following:

Write an efficient function to find the first nonrepeated character in a st

Answer 1

str = "aabcbdefgh"
lst = list(str)

for i in [(item, lst.count(item)) for item in set(lst)]:
    if i[1] == 1:
        print i[0],