Tirsvad-Udemy-100-days-of-code/046-scraping-the-billboard
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Page: Step 3 Create the Playlist
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Home da Home ms Home Setup and Run da Setup and Run ms Setup and Run Step 1 Scrape the Billboard da Step 1 Scrape the Billboard ms Step 1 Scrape the Billboard Step 2 YouTube Music Authentication da Step 2 YouTube Music Authentication ms Step 2 YouTube Music Authentication Step 3 Create the Playlist da Step 3 Create the Playlist ms Step 3 Create the Playlist Step 4 Search and Add Songs da Step 4 Search and Add Songs ms Step 4 Search and Add Songs
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Step 3 Create the Playlist
Tirsvad edited this page 2026-10-28 08:14:04 +01:00
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Step 3 - Create the Playlist

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What the step does

The program creates a private playlist named {date} Billboard 100, for example 2026-04-18 Billboard 100, with yt.create_playlist(title, description, privacy_status="PRIVATE"). Before it creates anything it loops through yt.get_library_playlists(); if a playlist with the same title exists, it uses that one.

python -m musical_time_machine --create-playlist

A live run with the author's browser.json: the first run creates the playlist, the second run creates nothing:

Live: create the playlist twice

The screenshot shows the tests of this step with a fake YouTube Music: the first call creates one playlist, the second call for the same date creates none.

Tests of step 3: the playlist is created once

What we gained

  • Idempotence. An operation you can run twice with the same result is safe to repeat. Checking for an existing playlist first means a crash or a second run never fills the library with duplicates.
  • One place for a name. The playlist title and description are built from templates in constants.py by one function, so the check and the creation can never disagree about the title.
  • Reading an API's real answer. create_playlist returns the playlist id on success but an error dictionary on failure; the adapter checks which one it got and raises a clear error.
  • Privacy by default. Creating the playlist as PRIVATE means a test run never publishes anything.

Musical Time Machine

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