Python|下载完整的 Youtube 播放列表的程序

Python是一种多用途编程语言，广泛用于编写小型任务的脚本。让我们看看如何使用Python制作自己的 Youtube 播放列表下载器。尽管市场上有许多可用的软件，但是让您自己为该目的服务是一项非常重要的学习和令人印象深刻的事情。

需要的模块：

• BeautifulSoup bs4
• PyQt5
• PyQtWebEngine
• 系统模块
• urllib 模块
• pytube 模块

它是如何工作的？

从 YouTube 播放列表的给定 URL，我们的程序将执行网络抓取并获取所有 YouTube 视频链接并将其附加到链接数组下。然后使用pytube库，我们将从链接数组中的链接下载相应的 YouTube 视频。下载 YouTube 视频的参数（质量、mime_type 等）可以在流构造函数中指定。视频将以原始视频的名称下载。

让我们看看代码：

Python3

# Importing libraries
import bs4 as bs
import sys
import urllib.request
from PyQt5.QtWebEngineWidgets import QWebEnginePage
from PyQt5.QtWidgets import QApplication
from PyQt5.QtCore import QUrl
import pytube  # library for downloading youtube videos
 
 
class Page(QWebEnginePage):
    def __init__(self, url):
        self.app = QApplication(sys.argv)
        QWebEnginePage.__init__(self)
        self.html = ''
        self.loadFinished.connect(self._on_load_finished)
        self.load(QUrl(url))
        self.app.exec_()
 
    def _on_load_finished(self):
        self.html = self.toHtml(self.Callable)
        print('Load finished')
 
    def Callable(self, html_str):
        self.html = html_str
        self.app.quit()
 
 
links = []
 
 
def exact_link(link):
    vid_id = link.split('=')
    # print(vid_id)
    str = ""
    for i in vid_id[0:2]:
        str += i + "="
 
    str_new = str[0:len(str) - 1]
    index = str_new.find("&")
 
    new_link = "https://www.youtube.com" + str_new[0:index]
    return new_link
 
 
url = "https://www.youtube.com/watch?v=lcJzw0JGfeE&list=PLqM7alHXFySENpNgw27MzGxLzNJuC_Kdj"
# Scraping and extracting the video
# links from the given playlist url
page = Page(url)
count = 0
 
soup = bs.BeautifulSoup(page.html, 'html.parser')
for link in soup.find_all('a', id='thumbnail'):
 
    # not using first link because it is
    # playlist link not particular video link
    if count == 0:
        count += 1
        continue
    else:
        try:
              # Prevents error for links with no href.
            vid_src = link['href']
            # print(vid_src)
            # keeping the format of link to be
            # given to pytube otherwise in some cases
            new_link = exact_link(vid_src)
 
            # error might occur due to this
            # print(new_link)
 
            # appending the link to the links array
            links.append(new_link)
        except Exception as exp:
            pass # No function necessary for invalid  tags.
 
# print(links)
 
# downloading each video from
# the link in the links array
for link in links:
    yt = pytube.YouTube(link)
 
    # Downloaded video will be the best quality video
    stream = yt.streams.filter(progressive=True,
                               file_extension='mp4').order_by(
        'resolution').desc().first()
    try:
        stream.download()
        # printing the links downloaded
        print("Downloaded: ", link)
    except:
        print('Some error in downloading: ', link)

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输出：