This is because str.index(ch) will return the index where ch occurs the first time. Try:
def find(s, ch):
return [i for i, ltr in enumerate(s) if ltr == ch]
This will return a list of all indexes you need.
P.S. Hugh’s answer shows a generator function (it makes a difference if the list of indexes can get large). This function can also be adjusted by changing [] to ().
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