带有GUI

Question

我正在尝试使用python3使用GUI构建youtube下载程序。 在学习了python的基础知识后，我正在尝试构建一个。我正在使用“pafy”和“TKinter”模块。

以下是GUI中涉及的小部件 1.输入URL的一个输入字段 2.旁边粘贴按钮 3.媒体选择下拉菜单 4.另外一个下拉菜单列出媒体质量（取决于以前的媒体输入） 5.最后一个下载按钮

这是我的代码

from tkinter import *
from tkinter import ttk
import pafy

master = Tk()

media_option = StringVar()

audio_quality_lsit = []
audio_quality_drop_menu = StringVar()

video_quality_lsit = []
video_quality_drop_menu = StringVar()


def url():
    global data
    url = url_field.get()
    data = pafy.new(url)


def audio():
    global selected_audio
    audio_streams = data.audiostreams
    for audio_quality in audio_streams:
        audio_quality_lsit.append(audio_quality.bitrate)
    selected_audio = audio_quality_drop_menu.get()
    print("selected_audio") #Debug Statement
    Label(master, text="Audio Bitrate: ").grid(row=7, column=1)
    show_drop_menu = OptionMenu(master, audio_quality_drop_menu, *audio_quality_lsit)
    show_drop_menu.grid(row=9, column=1)



def video():
    global selected_video
    video_streams = data.streams
    for video_quality in video_streams:
        video_quality_lsit.append(video_quality.resolution)
    selected_video = video_quality_drop_menu.get()
    print("selected_video")  #Debug Statement
    Label(master, text="Video Quality: ").grid(row=7, column=1)
    show_drop_menu = OptionMenu(master, video_quality_drop_menu, *video_quality_lsit)
    show_drop_menu.grid(row=9, column=1)


def media_select(self):
    global  A_V
    A_V = media_option.get()
    if A_V == "Audio":
        audio()
    elif A_V == "Video":
        video()


def download():
    if selected_audio:
        print("Audio")  #Debug Statement
        selected_audio.download(quiet=False)
    elif selected_video:
        print("Video")  #Debug Statement
        selected_video.download(quiet=False)


Label(master, text="YouTube URL:").grid(row=0)
url_field = Entry(master)
url_field.grid(row=0, column=1)

Button(master, text='Paste URL', command=url).grid(row=0, column=4, sticky=W, pady=10)
Button(master, text='Download', command=download).grid(row=12, column=4, sticky=W, pady=10)
Label(master, text="Media Type: ").grid(row=3)

media_drop_menu = OptionMenu(master, media_option, "Audio", "Video", command=media_select)
media_drop_menu.grid(row=5, column=0)

mainloop()

我坚持“下载功能”。我正确使用该功能吗？ 调用函数有什么问题吗？ 还有一件事，抱歉，如果是转储问题。 为什么我们必须这样做，

from tkinter import *
from tkinter import ttk    

根据我的理解，当我们使用“*”时，将导入库中存在的所有模块。再次为什么我们必须使用“来自tkinter import ttk”。

请帮帮我。

更新 @JoshuaNixon感谢重播。 我对“课程”知之甚少所以首先我学习了它的基础知识并进行了一些修改。

以下是代码：

from tkinter import *
import pafy

class YouTubeDownloader:
    def __init__(self,master):
        self.master = master
        master.title("Youtube Downloader")
        self.media_option = StringVar()
        self.audio_quality_lsit = []
        self.audio_quality_drop_menu = StringVar()
        self.video_quality_lsit = []
        self.video_quality_drop_menu = StringVar()
        Label(master, text="YouTube URL:").grid(row=0)
        self.url_field = Entry(master)
        self.url_field.grid(row=0, column=1)
        Button(master, text='Paste URL', command=self.url).grid(row=0, column=4, sticky=W, pady=10)
        Button(master, text='Download', command=self.download).grid(row=12, column=4, sticky=W, pady=10)
        Label(master, text="Media Type: ").grid(row=3)
        media_drop_menu = OptionMenu(master, self.media_option, "Audio", "Video", command=self.media_select)
        media_drop_menu.grid(row=5, column=0)


    def url(self):
        global data
        url = self.url_field.get()
        data = pafy.new(url)


    def media_select(self):
        global  A_V
        A_V = self.media_option.get()
        if A_V == "Audio":
            audio()
        elif A_V == "Video":
            video()


    def audio():
        global selected_audio
        audio_streams = self.data.audiostreams
        for audio_quality in audio_streams:
            audio_quality_lsit.append(audio_quality.bitrate)
        selected_audio = audio_quality_drop_menu.get()
        print("selected_audio") #Debug Statement
        Label(master, text="Audio Bitrate: ").grid(row=7, column=1)
        show_drop_menu = OptionMenu(master, audio_quality_drop_menu, *audio_quality_lsit)
        show_drop_menu.grid(row=9, column=1)


    def video(self):
        global selected_video
        video_streams = self.data.streams
        for video_quality in video_streams:
            video_quality_lsit.append(video_quality.resolution)
        selected_video = video_quality_drop_menu.get()
        print("selected_video")  #Debug Statement
        Label(master, text="Video Quality: ").grid(row=7, column=1)
        show_drop_menu = OptionMenu(master, video_quality_drop_menu, *video_quality_lsit)
        show_drop_menu.grid(row=9, column=1)


    def download(self):
        if selected_audio:
            print("Audio")  #Debug Statement
            self.selected_audio.download(quiet=False)
        elif selected_video:
            print("Video")  #Debug Statement
            self.selected_video.download(quiet=False)



root = Tk()
my_youtube = YouTubeDownloader(root)
root.mainloop()

当我运行代码时，我得到了GUI。复制粘贴URL字段后，我在“media_select（）”中收到错误，说明

“TypeError：media_select（）需要1个位置参数，但是2个被赋予”。

您建议使用两个类。由于我还是初学者，我对“自我”论证感到困惑。所以我用了单课。

你能告诉我我哪里出错了。

谢谢。

Answer 1

所有语法错误均已解决。我认为您只能解决一个例外。

使用类时，请使用self.*进行引用，

from Tkinter import *
import pafy

class YouTubeDownloader:
    def __init__(self,master):
        self.master = master
        master.title("Youtube Downloader")
        self.media_option = StringVar()
        self.audio_quality_lsit = []
        self.audio_quality_drop_menu = StringVar()
        self.video_quality_lsit = []
        self.video_quality_drop_menu = StringVar()
        Label(master, text="YouTube URL:").grid(row=0)
        self.url_field = Entry(master)
        self.url_field.grid(row=0, column=1)
        Button(master, text='Paste URL', command=self.url).grid(row=0, column=4, sticky=W, pady=10)
        Button(master, text='Download', command=self.download).grid(row=12, column=4, sticky=W, pady=10)
        Label(master, text="Media Type: ").grid(row=3)
        media_drop_menu = OptionMenu(master, self.media_option, "Audio", "Video", command=self.media_select)
        media_drop_menu.grid(row=5, column=0)
        self.data = []

    def url(self):
        global data
        url = self.url_field.get()
        self.data = pafy.new(url)

    def media_select(self, a):
        global A_V
        A_V = self.media_option.get()
        if A_V == "Audio":
            # for functions of same class use self.function()
            self.audio()
        elif A_V == "Video":
            self.video()

    def audio(self):
        global selected_audio
        audio_streams = self.data.audiostreams
        for audio_quality in audio_streams:
            self.audio_quality_lsit.append(audio_quality.bitrate)
        selected_audio = self.audio_quality_drop_menu.get()
        print("selected_audio") #Debug Statement
        Label(self.master, text="Audio Bitrate: ").grid(row=7, column=1)
        show_drop_menu = OptionMenu(self.master, self.audio_quality_drop_menu, *self.audio_quality_lsit)
        show_drop_menu.grid(row=9, column=1)

    def video(self):
        global selected_video
        video_streams = self.data.streams
        for video_quality in video_streams:
            self.video_quality_lsit.append(video_quality.resolution)
        selected_video = self.video_quality_drop_menu.get()
        print("selected_video")  #Debug Statement
        Label(self.master, text="Video Quality: ").grid(row=7, column=1)
        show_drop_menu = OptionMenu(self.master, self.video_quality_drop_menu, *self.video_quality_lsit)
        show_drop_menu.grid(row=9, column=1)

    def download(self):
        if selected_audio:
            print("Audio")  #Debug Statement
            self.selected_audio.download(quiet=False)
        elif selected_video:
            print("Video")  #Debug Statement
            self.selected_video.download(quiet=False)

root = Tk()
my_youtube = YouTubeDownloader(root)
root.mainloop()