Chapter 13 - error: db type could not be determined

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For anyone else who might encounter this issue who is using Python 3.13 and macOS.

In Chapter 13, under section Shelve, you may encounter the following error:
error: db type could not be determined

and in the subsequent cell:
NameError: name 'db' is not defined

FIX is to amend the following cell:

import shelve

db = shelve.open(db_file, 'c')
db

To this:

import shelve
import os

db = shelve.open(db_file, 'n', writeback=False)
db

Following the official Python docs for shelve.open

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Another solution:

import shelve
import os
import dbm.dumb

db = shelve.Shelf(dbm.dumb.open(db_file, 'n'))
db