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Change cat into bat (a) with a list of letters and (b) with a string. Which one is easier?
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Change cat into bat (a) with a list of letters and (b) with a string. Which one is easier?
Need a reminder? The key ideaShow
Lists can be changed in place. Strings cannot.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, compare your working with the solution.
- (a) List.
letters = ["c", "a", "t"], thenletters[0] = "b". The list is now['b', 'a', 't']."".join(letters)makes the wordbat. - (b) String. We cannot write
word[0] = "b". We build a new string:"b" + word[1:], which isbat.
A list is easier to change. A string is fixed, so we make a new one.
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