First non repeating character

Problem to find the first non repeating character. If there is no non repeating character means print "None".

Example-1:

Input    : s = "hello"
Output   : h  

Example-2:

Input    : s = "world"
Output   : w   

Example-3:

Input    : s = "oppo"
Output   : None   

Solution

s = "hello"

for x in s:

    if(s.count(x) == 1):

        print(x)

        break

else:

    print("None")

Output

h