def unique_Characters(str):
    
    for i in range(len(str)):
        for j in range(i + 1,len(str)): 
            if (str[i] == str[j]):
                return False;
    return True;
def unique_Characters(str):
    for A in range(len(str)):
        for j in range(A + 1, len(str)):
           
            if str[A] == str[j]:
                return False
    return True