代码如下：

import os.path
import tkinter as tk
import tkinter.ttk as ttk
import tkinter.filedialog as tf
import pytube
from urllib.error import URLError
import tkinter.messagebox as tm
import requests
import io
from PIL import ImageTk, Image
import threading
import subprocess
from pytube.exceptions import *class ScrollableFrame(tk.Frame):def __init__(self, container: tk.Misc | None, *args, **kwargs):super().__init__(container, *args, **kwargs)self.width = kwargs['width']self.height = kwargs['height']canvas = tk.Canvas(self, width=self.width, height=self.height)scrollbar = ttk.Scrollbar(self, orient="vertical", command=canvas.yview)self.scrollable_frame = tk.Frame(canvas, width=self.width, height=self.height)self.scrollable_frame.bind("<Configure>", lambda e: canvas.configure(scrollregion=canvas.bbox("all")))canvas.create_window((0, 0), window=self.scrollable_frame, anchor="nw")canvas.configure(yscrollcommand=scrollbar.set)canvas.pack(side="left", fill="both", expand=True)scrollbar.pack(side="right", fill="y")def _on_mousewheel(event):  # 鼠标滚轮canvas.yview_scroll(int(-1 * (event.delta / 120)), "units")canvas.bind_all("<MouseWheel>", _on_mousewheel)  # 绑定鼠标滚class TubeVideo:def __init__(self, url, progressbar: ttk.Progressbar, label: tk.Label, root: tk.Tk, frame: tk.Frame):self.progressbar = progressbarself.label = labelself.root = rootself.frame = frameself.yt = pytube.YouTube(url,on_progress_callback=lambda stream, chunk, bytes_remaining: self.on_progress(bytes_remaining),on_complete_callback=lambda stream, file_path: self.on_complete(file_path),use_oauth=True, allow_oauth_cache=True)self.success = Truetry:self.title = self.yt.titleexcept (URLError, Exception) as e:print(type(e), e)self.success = Falseself.percentage = 0.0if self.success:self.total_size = self.yt.streams.get_highest_resolution().filesizeself.length = self.yt.lengthelse:passdef get_title(self):return self.titledef get_succeed(self):return self.successdef get_size(self, res):self.total_size = self.yt.streams.get_by_resolution(res).filesizedef download_video(self, path, is_highest, res=None):self.label.config(foreground='gold')if is_highest:stream = self.yt.streams.get_highest_resolution()else:stream = self.yt.streams.get_by_resolution(res)os.path.join(path, f"{self.title}.mp4")stream.download(output_path=path)def calc_percentage(self, bytes_remaining):bytes_downloaded = self.total_size - bytes_remainingself.percentage = bytes_downloaded / self.total_size * 100def get_thumbnail_url(self):url = '/'.join(self.yt.thumbnail_url.split('/')[:-1]) + "/hqdefault.jpg"return urldef on_progress(self, bytes_remaining):self.calc_percentage(bytes_remaining)self.progressbar['value'] = int(self.percentage)self.label['text'] = (f"{(self.total_size - bytes_remaining) / 1024 / 1024:.2f}MB/"f"{self.total_size / 1024 / 1024:.2f}MB {self.percentage:.2f}%")self.root.update()def on_complete(self, file_path):try:os.startfile(file_path)except AttributeError:try:subprocess.run(['open', file_path])except (OSError, Exception):tm.showerror("")self.label.config(foreground="green")self.label['text'] = "下载完成!单击关闭。"self.frame['cursor'] = 'hand2'self.frame.bind("<Button-1>", lambda e: (self.frame.destroy(), self.root.update()))self.root.update()class EachVideoFrame:def __init__(self, _root, url, path, rel=None):self.rel = relself.path = pathself.url = urlself.root = _rootself.frame = tk.Frame(_root)  # 690*120self.info_frame = tk.Frame(self.frame)self.progress_frame = tk.Frame(self.frame)self.image = tk.Label(self.frame)self.title = tk.Label(self.info_frame, font=("黑体", 20), wraplength=200)self.info = tk.Label(self.info_frame, font=("黑体", 10), fg='grey')self.text = tk.Label(self.progress_frame, justify='left')self.progressbar = ttk.Progressbar(self.progress_frame, orient="horizontal", length=300, mode="determinate")self.yt: TubeVideo | None = Noneself.loading = tk.Label(self.frame, text="正在加载视频信息...", font=("黑体", 30))self.loading.pack()self.root.update()self.succeed = Truethreading.Thread(target=self.network_part).start()def network_part(self):try:self.yt = TubeVideo(self.url, self.progressbar, self.text, self.root, self.frame)except RegexMatchError:tm.showerror("错误！", "下载失败，请输入正确的URL地址！")self.frame.destroy()returnexcept AgeRestrictedError:tm.showerror("错误！", "该视频无法下载，因为它是年龄限制的。")self.frame.destroy()returnexcept (ConnectionError, Exception):tm.showerror("错误！", "下载失败，请检查网络连接或视频链接是否正确。")self.frame.destroy()returnif not self.yt.get_succeed():tm.showerror("错误！", "无法下载该视频，请检查网络连接或视频链接是否正确。")self.succeed = Falsereturnresponse = requests.get(self.yt.get_thumbnail_url(), stream=True)image_bytes = io.BytesIO(response.content)img_obj = Image.open(image_bytes)w, h = img_obj.sizeimg_obj = img_obj.resize((int(w * 0.3), int(h * 0.3)))img = ImageTk.PhotoImage(img_obj)self.image['image'] = imgself.image.image = imgtitle = self.yt.get_title()if len(title) >= 40:title = title[:37] + '...'self.title['text'] = titleself.info["text"] = f'{self.yt.total_size / 1024 / 1024:.2f}MB  {self.yt.length // 60}:{str(self.yt.length % 60)[:1]}S'self.text['text'] = f"00.00MB/{self.yt.total_size / 1024 / 1024:.2f}MB 00.00%"self.loading.destroy()del self.loadingself.image.grid(row=0, column=0, padx=5, pady=5)self.title.pack(padx=5, pady=5)self.info.pack(padx=5, pady=5)self.info_frame.grid(row=0, column=1, padx=5, pady=5)self.text.pack(side=tk.TOP, padx=5, pady=5)self.progressbar.pack(side=tk.TOP, fill=tk.X, expand=True, padx=5, pady=5)self.progress_frame.grid(row=0, column=2, sticky="w", padx=5, pady=5)if self.rel is not None:self.yt.download_video(path=self.path, is_highest=False, res=self.rel)else:self.yt.download_video(path=self.path, is_highest=True)def pack(self, *args, **kwargs):self.frame.pack(*args, **kwargs)def grid(self, *args, **kwargs):self.frame.grid(*args, **kwargs)def place(self, *args, **kwargs):self.frame.place(*args, **kwargs)class NewVideo:def __init__(self, root):self.var = tk.StringVar()self.var.set("Best")self.filenameVar = tk.StringVar()self._root = rootself.root = tk.Toplevel(self._root)self.root.title("YouTube 视频下载器--新建下载任务")self.label = tk.Label(self.root, text="输入视频链接:")self.label.grid(row=0, column=0, padx=5, pady=5)self.entry = ttk.Entry(self.root)self.entry.grid(row=0, column=1, columnspan=3, padx=5, pady=5, sticky=tk.W + tk.E)self.label2 = tk.Label(self.root, text="下载清晰度:")self.label2.grid(row=1, column=0, padx=5, pady=5)self.radios = ttk.Radiobutton(self.root, text="最高画质", value='Best', variable=self.var)self.radios2 = ttk.Radiobutton(self.root, text="标清", value='480p', variable=self.var)self.radios3 = ttk.Radiobutton(self.root, text="流畅", value='360p', variable=self.var)self.radios.grid(row=1, column=1, padx=5, pady=5)self.radios2.grid(row=1, column=2, padx=5, pady=5)self.radios3.grid(row=1, column=3, padx=5, pady=5)self.label3 = tk.Label(self.root, text="保存到：")self.label3.grid(row=2, column=0, padx=5, pady=5)self.entry2 = ttk.Entry(self.root, textvariable=self.filenameVar)self.entry2.grid(row=2, column=1, columnspan=2, padx=5, pady=5, sticky=tk.W + tk.E)self.btn = ttk.Button(self.root, text="浏览", command=self.blowse)self.btn.grid(row=2, column=3, padx=5, pady=5)self.btn2 = ttk.Button(self.root, text="下载", command=self.download)self.btn2.grid(row=3, column=0, columnspan=4, padx=5, pady=5, sticky=tk.W + tk.E)def blowse(self):filename = tf.askdirectory()self.filenameVar.set(filename)def download(self):url = self.entry.get()path = self.filenameVar.get()if path == '':tm.showerror("错误，请输入有效的地址")returnquality = self.var.get()frame = EachVideoFrame(self._root, url, path, None if quality == "Best" else quality)frame.pack()self.root.destroy()class Application:def __init__(self):self.root = tk.Tk()self.root.title("YouTube 视频下载器")self.add_frame = tk.Frame(self.root)self.btn1 = ttk.Button(self.add_frame, text="下载一个新视频", command=self.add_video)self.btn1.pack(padx=5, pady=5)self.add_frame.pack(side=tk.TOP, fill=tk.X)self.frame = ScrollableFrame(self.root, width=690, height=180)self.frame.pack(side=tk.TOP, expand=True, fill=tk.BOTH)self.root.resizable(False, False)try:self.root.iconphoto(True, tk.PhotoImage(file="icon.png"))except (tk.TclError, FileNotFoundError, Exception):passdef add_video(self):NewVideo(self.frame.scrollable_frame)def run(self):self.root.mainloop()if __name__ == "__main__":app = Application()app.run()

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