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Starter code for chapter 7, infinite scroll.
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‎code/ch7_infinite_scroll/ch7_final_video_collector/.idea/.name‎

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‎code/ch7_infinite_scroll/ch7_final_video_collector/app.py‎

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import sys
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import flask
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import jinja_partials
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from services import video_service
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app = flask.Flask("app")
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def configure():
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print("Configuring Flask app:")
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register_template_ops()
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print("Registered template helpers")
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register_blueprints()
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print("Registered blueprints")
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setup_db()
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print("DB setup completed.")
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print("", flush=True)
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def register_template_ops():
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jinja_partials.register_extensions(app)
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helpers = {
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'len': len,
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'isinstance': isinstance,
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'str': str,
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'type': type
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}
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app.jinja_env.globals.update(**helpers)
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def register_blueprints():
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from views import home
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from views import videos
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from views import feed
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app.register_blueprint(home.blueprint)
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app.register_blueprint(videos.blueprint)
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app.register_blueprint(feed.blueprint)
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def setup_db():
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video_service.load_data()
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if __name__ == '__main__':
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configure()
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being_debugged = sys.gettrace() is not None
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app.run(debug=being_debugged)
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else:
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configure()

‎code/ch7_infinite_scroll/ch7_final_video_collector/db/videos.json‎

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[
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{
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"category": "Python",
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"image": "python.jpg",
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"videos": [
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{
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"id": "rDYKZG6Fn8o",
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"title": "Go Python, Go!",
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"url": "https://www.youtube.com/watch?v=rDYKZG6Fn8o",
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"author": "Python Bytes",
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"views": 347
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},
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{
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"id": "QltSJUlHbpw",
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"title": "A Space Filled Episode with Dr. Becky",
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"url": "https://www.youtube.com/watch?v=QltSJUlHbpw",
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"author": "Python Bytes",
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"views": 365
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},
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{
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"id": "4wjqsPtj2QY",
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"title": "HTMX - Clean Dynamic HTML Pages",
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"url": "https://www.youtube.com/watch?v=4wjqsPtj2QY",
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"author": "Talk Python",
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"views": 756
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},
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{
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"id": "cfrUF-UGehk",
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"title": "Python and Flask at the US Federal Election Commission",
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"url": "https://www.youtube.com/watch?v=cfrUF-UGehk",
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"author": "Talk Python",
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"views": 511
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},
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{
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"id": "36yw8VC3KU8",
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"title": "PyCon: Let's talk Databases in Python: SQLAlchemy and Alembic",
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"url": "https://www.youtube.com/watch?v=36yw8VC3KU8",
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"author": "Hannah Stepanek",
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"views": 10302
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},
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{
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"id": "pvaIi0l1GME",
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"title": "What we learned from Papermill to operationalize notebooks",
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"url": "https://www.youtube.com/watch?v=pvaIi0l1GME",
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"author": "Alan Yu and Vasu Bhog",
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"views": 789
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},
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{
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"id": "PnxlHfGdihI",
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"title": "A Python Developer Explores Apple's M1",
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"url": "https://www.youtube.com/watch?v=PnxlHfGdihI",
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"author": "Michael Kennedy",
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"views": 4654
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}
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]
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},
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{
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"category": "Apple",
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"image": "apple.jpg",
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"videos": [
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{
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"id": "R5BQ6yhhRJc",
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"title": "Andy's Pick & Pull - WWDC 2021",
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"url": "https://www.youtube.com/watch?v=R5BQ6yhhRJc",
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"author": "MacBreak Weekly",
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"views": 13720
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},
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{
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"id": "PnxlHfGdihI",
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"title": "A Python Developer Explores Apple's M1",
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"url": "https://www.youtube.com/watch?v=PnxlHfGdihI",
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"author": "Michael Kennedy",
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"views": 4654
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},
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{
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"id": "YisUywtzZK0",
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"title": "How Apple Private Relay Kills Data Profiling",
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"url": "https://www.youtube.com/watch?v=YisUywtzZK0",
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"author": "Rene Ritchie",
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"views": 65245
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},
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{
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"id": "vg0AF166eVI",
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"title": "Why the M1 Mac is SO FAST — Apple Silicon Explained!",
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"url": "https://www.youtube.com/watch?v=vg0AF166eVI",
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"author": "Rene Ritchie",
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"views": 523014
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},
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{
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"id": "0TD96VTf0Xs",
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"title": "WWDC 2021",
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"url": "https://www.youtube.com/watch?v=0TD96VTf0Xs",
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"author": "Apple",
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"views": 6655103
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},
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{
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"id": "4ecN7yGcqcQ",
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"title": "M1 iMac Unboxing and Review!",
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"url": "https://www.youtube.com/watch?v=4ecN7yGcqcQ",
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"author": "iJustine",
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"views": 623042
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}
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]
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},
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{
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"category": "JavaScript",
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"image": "javascript.jpg",
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"videos": [
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{
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"id": "4wjqsPtj2QY",
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"title": "HTMX - Clean Dynamic HTML Pages",
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"url": "https://www.youtube.com/watch?v=4wjqsPtj2QY",
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"author": "Talk Python",
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"views": 756
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},
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{
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"id": "qZXt1Aom3Cs",
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"title": "Vue JS Crash Course 2021",
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"url": "https://www.youtube.com/watch?v=qZXt1Aom3Cs",
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"author": "Traversy Media",
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"views": 265783
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},
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{
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"id": "OrxmtDw4pVI",
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"title": "Vue.js: The Documentary",
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"url": "https://www.youtube.com/watch?v=OrxmtDw4pVI",
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"author": "Honeypot",
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"views": 932606
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},
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{
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"id": "m_F8wSZT3QY",
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"title": "Wat - JavaScript misadventures",
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"url": "https://www.youtube.com/watch?v=3se2-thqf-A",
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"author": "Gary Bernhardt",
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"views": 866
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},
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{
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"id": "ahCwqrYpIuM",
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"title": "TypeScript - The Basics",
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"url": "https://www.youtube.com/watch?v=ahCwqrYpIuM",
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"author": "Fireship",
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"views": 772764
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}
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]
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},
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{
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"category": "EVs",
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"image": "ev.jpg",
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"videos": [
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{
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"id": "6RhtiPefVzM",
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"title": "Are Electric Cars Worse For The Environment? Myth Busted",
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"url": "https://www.youtube.com/watch?v=6RhtiPefVzM",
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"author": "Engineering Explained",
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"views": 1753659
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},
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{
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"id": "QMfxJEfb4lw",
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"title": "Rivian - Electric Adventure Vehicle",
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"url": "https://www.youtube.com/watch?v=QMfxJEfb4lw",
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"author": "Fully Charged Show",
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"views": 4029696
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},
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{
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"id": "A6RsmzCYB3I",
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"title": "New Hyundai Ioniq 5 full review - the 300-mile Tesla EV rival styled by Minecraft",
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"url": "https://www.youtube.com/watch?v=A6RsmzCYB3I",
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"author": "The Late Brake Show",
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"views": 938994
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},
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{
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"id": "QHOPFp1o3d0",
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"title": "Bolt: Best Non Tesla Electric Car?",
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"url": "https://www.youtube.com/watch?v=QHOPFp1o3d0",
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"author": "TheStraightPipes",
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"views": 512330
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},
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{
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"id": "3iRHYIwjFKw",
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"title": "Tesla Full Self Driving Beta Test Drive",
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"url": "https://www.youtube.com/watch?v=3iRHYIwjFKw",
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"author": "Tesla Raj",
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"views": 367345
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},
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{
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"id": "KOWz9-5T9pE",
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"title": "Formula E: 2021 Puebla E-Prix | Round 8",
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"url": "https://www.youtube.com/watch?v=KOWz9-5T9pE",
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"author": "ABB Formula E",
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"views": 43975
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}
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]
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},
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{
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"category": "Racing",
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"image": "racing.jpg",
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"videos": [
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{
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"id": "tvcuGoVhpxw",
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"title": "How to Trail Brake: A Step-by-Step Guide",
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"url": "https://www.youtube.com/watch?v=tvcuGoVhpxw",
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"author": "Driver61",
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"views": 210861
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},
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{
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"id": "eUdaWbr1KB4",
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"title": "Trail Braking: 5 Mistakes DESTROYING Your Lap Time",
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"url": "https://www.youtube.com/watch?v=eUdaWbr1KB4",
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"author": "Driver61",
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"views": 581747
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},
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{
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"id": "F5igCWjmeAU",
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"title": "My Very First Start in IndyCar",
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"url": "https://www.youtube.com/watch?v=F5igCWjmeAU",
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"author": "Romain Grosjean",
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"views": 960145
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},
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{
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"id": "KOWz9-5T9pE",
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"title": "Formula E: 2021 Puebla E-Prix | Round 8",
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"url": "https://www.youtube.com/watch?v=KOWz9-5T9pE",
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"author": "ABB Formula E",
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"views": 43975
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},
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{
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"id": "EU73gjQJXU4",
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"title": "IndyCar - Road America 2021 Highlights",
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"url": "https://www.youtube.com/watch?v=EU73gjQJXU4",
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"author": "Motorsports on NBC",
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"views": 43295
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},
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{
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"id": "9i2iA0R6IdA",
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"title": "The First Corner: Do's and Don'ts",
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"url": "https://www.youtube.com/watch?v=9i2iA0R6IdA",
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"author": "Driver61",
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"views": 46432
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},
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{
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"id": "X0WuN3poyVs",
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"title": "Biggest Sim Racing Tips (sim driver analysis)",
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"url": "https://www.youtube.com/watch?v=X0WuN3poyVs",
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"author": "Driver61",
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"views": 78817
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},
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{
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"id": "2wzy3HiW7SE",
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"title": "CAN YOU TELL THIS ISN'T REAL? - Corvette C8.R - Nordschleife",
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"url": "https://www.youtube.com/watch?v=2wzy3HiW7SE",
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"author": "Boosted Media",
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"views": 60007
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}
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]
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}
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]

‎code/ch7_infinite_scroll/ch7_final_video_collector/infrastructure/request_dict.py‎

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import flask
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from werkzeug.datastructures import MultiDict
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class RequestDictionary(dict):
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def __init__(self, *args, default_val=None, **kwargs):
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self.default_val = default_val
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super().__init__(*args, **kwargs)
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def __getattr__(self, key):
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return self.get(key, self.default_val)
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def create(default_val=None, **route_args) -> RequestDictionary:
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request = flask.request
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# Adding this retro actively. Some folks are experiencing issues where they
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# are getting a list rather than plain dict. I think it's from multiple
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# entries in the multidict. This should fix it.
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args = request.args
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if isinstance(request.args, MultiDict):
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args = request.args.to_dict()
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form = request.form
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if isinstance(request.args, MultiDict):
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form = request.form.to_dict()
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data = {
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**args, # The key/value pairs in the URL query string
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**request.headers, # Header values
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**form, # The key/value pairs in the body, from a HTML post form
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**route_args # And additional arguments the method access, if they want them merged.
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}
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return RequestDictionary(data, default_val=default_val)

‎code/ch7_infinite_scroll/ch7_final_video_collector/infrastructure/view_modifiers.py‎

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from functools import wraps
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import flask
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import werkzeug
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import werkzeug.wrappers
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def response(*, mimetype: str = None, template_file: str = None):
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def response_inner(f):
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@wraps(f)
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def view_method(*args, **kwargs):
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response_val = f(*args, **kwargs)
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if isinstance(response_val, werkzeug.wrappers.Response):
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return response_val
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if isinstance(response_val, flask.Response):
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return response_val
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if isinstance(response_val, dict):
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model = dict(response_val)
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else:
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model = dict()
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if template_file and not isinstance(response_val, dict):
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raise Exception(
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"Invalid return type {}, we expected a dict as the return value.".format(type(response_val)))
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if template_file:
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response_val = flask.render_template(template_file, **response_val)
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resp = flask.make_response(response_val)
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resp.model = model
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if mimetype:
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resp.mimetype = mimetype
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return resp
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return view_method
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return response_inner

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