Problems with string and lists (searching and replaceing)

[jblazi]

I should like to search certain characters in a string and when they are
found, I want to replace other characters in other strings that are at
the same position (for a very simply mastermind game) for my pupils.

This very simple thing does not seem simple at all.

If I use strings, I cannot replace their parts (though I can use
string.find for the searching). I think it is a bad idea that strings are
not mutable, but I suspect that this has been discussed here for ages.

I can use sequences instead, but then first I have to 'split' and 'join'.
Additionally, there is no 'find' for sequences (who knows why not) and so
I can choose between using 'index' that raises an exception (and we have
not covered exceptions yet) or I can ask whether the character is in the
string before using 'index' which is a bit artificial from the point of
view of my pupils. (It is all right with me.)

Do I oversee something?

TIA,
JB



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