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What to do to correct the error written below:

Greg Ewing greg.ewing at canterbury.ac.nz
Mon Apr 11 18:28:41 EDT 2022 
On 12/04/22 2:28 am, Peter Pearson wrote:
> By looping over elements in "books" and incrementing counter i,
> which is used as an index both for "books" and for "students",
> you will produce an error whenever the number of books exceeds
> the number of students.

More fundamentally, it assumes there is a one-to-one correspondence
between the list of books and the list of students.

It doesn't look like that is true here -- one is a list if students with
a given student ID (which doesn't make sense -- surely there should only
be one?) and the other is a list of books with a given isbn (presumably
all copies of the same book).

It would make more sense for there only to be a list of books, and just
one reference to the student, at that point in the code.

Generally this whole piece of code seems hopelessly confused and needs
to be re-thought.

-- 
Greg
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