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Python - SQLite - Databases: Getting Organized - placeholder

Head First Python: A Learner’s Guide to the Fundamentals of Python Programming, A Brain-Friendly Guide、 Paul Barry(著)、 O’Reilly Mediaの Chapter 12.(Databases: Getting Organized)、SHARPEN YOUR PENCIL(560/682)の解答を求めてみる。

Jupyter(コード、入出力結果)

PopulateTables.ipynb

import os
import DBcm

db_details = 'CoachDB.sqlite3'
FOLDER = 'swimdata'
files = os.listdir(FOLDER)
files.remove('.DS_Store')

SQL_SELECT = '''
select * from events
where distance = ? and stroke = ?
'''
SQL_INSERT = '''
insert into events
(distance, stroke)
values
(?, ?)
'''
with DBcm.UseDatabase(db_details) as db:
    for filename in files:
        _, _, distance, stroke = filename.removesuffix('.txt').split('-')
        db.execute(SQL_SELECT, (distance, stroke,))
        if not db.fetchall():
            db.execute(SQL_INSERT, (distance, stroke,))

with DBcm.UseDatabase(db_details) as db:
    db.execute('select * from events')
    results = db.fetchall()
results

[(1, '100m', 'Free'),
 (2, '100m', 'Back'),
 (3, '100m', 'Fly'),
 (4, '50m', 'Back'),
 (5, '200m', 'Free'),
 (6, '200m', 'Back'),
 (7, '50m', 'Free'),
 (8, '50m', 'Breast'),
 (9, '200m', 'IM'),
 (10, '100m', 'Breast'),
 (11, '400m', 'Free'),
 (12, '50m', 'Fly'),
 (13, '200m', 'Breast')]