s = 'python' → a string, immutable in Python.
len(s) = 6 → so range(len(s)) gives [0, 1, 2, 3, 4, 5].
Inside the loop
i = s[i].upper()
s[i] → gets a character from the string, like 'p', 'y', etc.
s[i].upper() → converts that character to uppercase.
But then, it assigns it to the loop variable i, not back into the string s.
So this line does not change s — it just temporarily reassigns i to a string value (like 'P'), but that’s discarded in the next iteration.
s was never modified, because strings are immutable and you didn’t reassign s itself.
E. python
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4ba36e7
1 month, 3 weeks ago