Description: Complete the code which should return true if the given object is a single ASCII letter (lower or upper case), false otherwise. Solution: 1. Get the ASCII code of the argument. 2. Check whether the obtained ASCII code corresponds to the alphabet. 3. True if true, false otherwise. def is_letter(s): ascii_num = len(s) == 1 and ord(s) return (ascii_num >= 65 and ascii_num = 97 and asci..