Yes, there are Python libraries that handle the YouTube API. One of the most commonly used ones is the Google API Python Client, which provides an easy-to-use interface for making requests to the YouTube API.

To fetch your "Watch Later" list from YouTube and put them into the ttk.Treeview widget, you'll need to perform the following steps:

   1. Install the google-auth and google-api-python-client libraries using pip. These are required for authentication and accessing the YouTube API.

   2. Create a Google Cloud Platform (GCP) project and enable the YouTube Data API. You'll need to create API credentials for your project, which you'll use to authenticate your API requests.

   3. Use the API client library to authenticate your API requests using your API credentials.

   4. Make a request to the YouTube API to retrieve the details of your "Watch Later" videos, including the video titles and URLs. 
   You can use the API client library to make this request and parse the JSON response to extract the relevant information.

   5. Add the video titles and links to the ttk.Treeview widget using the insert method.

Here's an example code snippet that demonstrates how to do this:


    import google.auth
    from googleapiclient.discovery import build
    import tkinter as tk
    from tkinter import ttk

    # Set up API credentials and authenticate the client
    creds, project_id = google.auth.default(scopes=['https://www.googleapis.com/auth/youtube.force-ssl'])
    youtube = build('youtube', 'v3', credentials=creds)

    # Set the ID for the "Watch Later" playlist
    playlist_id = 'WL'

    # Make a request to the YouTube API to retrieve the playlist items
    playlist_items = youtube.playlistItems().list(
        part='snippet',
        playlistId=playlist_id,
        maxResults=50
    ).execute()

    # Extract the video titles and URLs from the API response
    video_titles = [item['snippet']['title'] for item in playlist_items['items']]
    video_urls = ['https://www.youtube.com/watch?v=' + item['snippet']['resourceId']['videoId'] for item in playlist_items['items']]

    # Create a new Tkinter window
    root = tk.Tk()
    root.title("Watch Later Videos")

    # Create a treeview widget to display the video titles and links
    tree = ttk.Treeview(root)
    tree["columns"] = ("title", "link")
    tree.heading("title", text="Title")
    tree.heading("link", text="Link")

    # Add the video titles and links to the treeview
    for i, title in enumerate(video_titles):
        tree.insert("", i, text=title, values=(title, video_urls[i]))

    tree.pack(fill=tk.BOTH, expand=True)

    root.mainloop()


Note that you may need to modify the code to fit your specific needs, such as changing the number of results to retrieve or customizing the appearance of the ttk.treeview widget.
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