如何结合 pytube 和 tkinter 标签来显示进度？

Question

我正在编写从 youtube 下载歌曲的小程序（使用 pytube） 我想添加 python tkinter GUI 以在文件下载时显示百分比值。

现在当我执行我的代码时，程序首先下载文件（大约需要 60 秒），然后才显示 100% 的标签。如果我想在下载文件的同时看到标签值从 0% 上升到 100%，我应该在代码中进行哪些更改？

代码 Python3：

from pytube import YouTube
import tkinter as tk
from tkinter import ttk

# main application shows:
# label Loading..
# label which configure values when file is downloading 
# inderterminate progress bar
class MainApplication(tk.Frame):

def __init__(self, master=None, *args, **kwargs):
    tk.Frame.__init__(self, master)
    self.master = master

    self.master.grid_rowconfigure(0, weight=0)
    self.master.grid_columnconfigure(0, weight=1)

    self.youtubeEntry = "https://www.youtube.com/watch?v=vVy9Lgpg1m8"
    self.FolderLoacation = "C:/Users/Jonis/Desktop/"

    # pytube
    self.yt = YouTube(self.youtubeEntry)

    video_type = self.yt.streams.filter(only_audio = True).first()

    # file size of a file
    self.MaxfileSize = video_type.filesize

    # Loading label
    self.loadingLabel = ttk.Label(self.master, text="Loading...", font=("Agency FB", 30))
    self.loadingLabel.grid(pady=(100,0))

    # loading precent label which must show % donwloaded
    self.loadingPercent = tk.Label(self.master, text="", fg="green", font=("Agency FB", 30))
    self.loadingPercent.grid(pady=(30,30))

    # indeterminate progress bar
    self.progressbar = ttk.Progressbar(self.master, orient="horizontal", length=500, mode='indeterminate')
    self.progressbar.grid(pady=(50,0))
    self.progressbar.start()    

    # call Download file func
    self.DownloadFile


def DownloadFile(self):
    self.yt.register_on_progress_callback(self.show_progress_bar)
    self.yt.streams.filter(only_audio=True).first().download(self.FolderLoacation)

# func count precent of a file
def show_progress_bar(self, stream=None, chunk=None, file_handle=None, bytes_remaining=None):

    # loadingPercent label configure value %
    self.loadingPercent.config(text=str(100 - (100*(bytes_remaining/self.MaxfileSize))))


root = tk.Tk()
root.title("Youtube downloader")
root.geometry("1920x1080")
app = MainApplication(root)
root.mainloop()` 

Answer 1

问题似乎是您需要同时致电self.DownloadFile 和self.show_progress_bar，就像您提到的那样。同时调用这两个函数最好的解决方案是使用线程库

from pytube import YouTube
import tkinter as tk
from tkinter import ttk
import threading


# main application shows:
# label Loading..
# label which configure values when file is downloading 
# inderterminate progress bar
class MainApplication(tk.Frame):

def __init__(self, master=None, *args, **kwargs):
    tk.Frame.__init__(self, master)
    self.master = master

    self.master.grid_rowconfigure(0, weight=0)
    self.master.grid_columnconfigure(0, weight=1)

    self.youtubeEntry = "https://www.youtube.com/watch?v=vVy9Lgpg1m8"
    self.FolderLoacation = "C:/Users/Jonis/Desktop/"

    # pytube
    self.yt = YouTube(self.youtubeEntry)

    video_type = self.yt.streams.filter(only_audio = True).first()

    # file size of a file
    self.MaxfileSize = video_type.filesize

    # Loading label
    self.loadingLabel = ttk.Label(self.master, text="Loading...", font=("Agency FB", 30))
    self.loadingLabel.grid(pady=(100,0))

    # loading precent label which must show % donwloaded
    self.loadingPercent = tk.Label(self.master, text="0", fg="green", font=("Agency FB", 30))
    self.loadingPercent.grid(pady=(30,30))

    # indeterminate progress bar
    self.progressbar = ttk.Progressbar(self.master, orient="horizontal", length=500, mode='indeterminate')
    self.progressbar.grid(pady=(50,0))
    self.progressbar.start()    

    threading.Thread(target=self.yt.register_on_progress_callback(self.show_progress_bar)).start()

    # call Download file func
    threading.Thread(target=self.DownloadFile).start()



def DownloadFile(self):


    self.yt.streams.filter(only_audio=True).first().download(self.FolderLoacation)

# func count precent of a file
def show_progress_bar(self, stream=None, chunk=None, file_handle=None, bytes_remaining=None):

    # loadingPercent label configure value %
    self.loadingPercent.config(text=str(int(100 - (100*(bytes_remaining/self.MaxfileSize)))))


root = tk.Tk() 
root.title("Youtube downloader")
root.geometry("1920x1080")
app = MainApplication(root)
root.mainloop()