E 103 functions.py x Converts letters in a string to alternate case. Letters at an even index are converted to (or left as) upper-case, Letters at an odd index are converted to (or left as) lower-case. Non-letters are ignored. Use: alternating = alternate_case(string) Parameters: width - maximum width in characters of triangle (int >= 1) Returns: alternating - the resulting string (str) 10 "n" 11 H Impotts 12 from t04 functions import wide triangle 13 14 CASES = list (range (1,10)) 15 16 for case in CASES: 17 print (f'wide triangle (fcasef) ') 18 wide triangle (case) 19 print ()