Python无法输出数据

yunlongzhuhuo

[Python] 纯文本查看 复制代码

import os, sys
from tkinter import *
from tkinter.font import Font
from tkinter.ttk import *
from tkinter.messagebox import *
from tkinter.filedialog import askdirectory

class Application_ui(Frame):
    #这个类仅实现界面生成功能，具体事件处理代码在子类Application中。

    def __init__(self, master=None):
        Frame.__init__(self, master)
        self.master.title('视频下载工具')
        self.master.geometry('363x239+543+330')
        self.createWidgets()

    def createWidgets(self):
        self.top = self.winfo_toplevel()

        self.style = Style()

        self.Label1Var = StringVar(value='视频地址：')
        self.style.configure('TLabel1.TLabel', anchor='center', font=('Microsoft YaHei UI',9))
        self.Label1 = Label(self.top, text='视频地址：', textvariable=self.Label1Var, style='TLabel1.TLabel')
        self.Label1.setText = lambda x: self.Label1Var.set(x)
        self.Label1.text = lambda : self.Label1Var.get()
        self.Label1.place(relx=0.11, rely=0.167, relwidth=0.179, relheight=0.105)

        global url
        self.Text1Var = StringVar()
        self.Text1 = Entry(self.top, textvariable=self.Text1Var, font=('Microsoft YaHei UI',9))
        self.Text1.setText = lambda x: self.Text1Var.set(x)
        url = lambda : self.Text1Var.get()
        self.Text1.place(relx=0.309, rely=0.167, relwidth=0.554, relheight=0.105)

        self.Label2Var = StringVar(value='视频保存地址：')
        self.style.configure('TLabel2.TLabel', anchor='w', font=('Microsoft YaHei UI',9))
        self.Label2 = Label(self.top, text='视频保存地址：', textvariable=self.Label2Var, style='TLabel2.TLabel')
        self.Label2.setText = lambda x: self.Label2Var.set(x)
        self.Label2.text = lambda : self.Label2Var.get()
        self.Label2.place(relx=0.066, rely=0.469, relwidth=0.245, relheight=0.105)

        global location
        self.Text2Var = StringVar()
        self.Text2 = Entry(self.top, textvariable=path, font=('Microsoft YaHei UI',9))
        self.Text2.setText = lambda x: self.Text2Var.set(x)
        location = lambda : self.Text2Var.get()
        self.Text2.place(relx=0.331, rely=0.469, relwidth=0.399, relheight=0.105)

        self.Command1Var = StringVar(value='浏览')
        self.style.configure('TCommand1.TButton', font=('Microsoft YaHei UI',9))
        self.Command1 = Button(self.top, text='浏览', textvariable=self.Command1Var, command=self.Command1_Cmd, style='TCommand1.TButton')
        self.Command1.setText = lambda x: self.Command1Var.set(x)
        self.Command1.text = lambda : self.Command1Var.get()
        self.Command1.place(relx=0.771, rely=0.469, relwidth=0.135, relheight=0.105)

        self.Command2Var = StringVar(value='下载')
        self.style.configure('TCommand2.TButton', font=('Microsoft YaHei UI',9))
        self.Command2 = Button(self.top, text='下载', textvariable=self.Command2Var, command=self.Command2_Cmd, style='TCommand2.TButton')
        self.Command2.setText = lambda x: self.Command2Var.set(x)
        self.Command2.text = lambda : self.Command2Var.get()
        self.Command2.place(relx=0.397, rely=0.736, relwidth=0.201, relheight=0.172)


class Application(Application_ui):
    #这个类实现具体的事件处理回调函数。界面生成代码在Application_ui中。
    def __init__(self, master=None):
        Application_ui.__init__(self, master)

    def Command1_Cmd(self, event=None):
        path_ = askdirectory()
        path.set(path_)

    def Command2_Cmd(self, event=None):
        a = location()
        print(a)
        b = url()
        print(b)

if __name__ == "__main__":
    top = Tk()
    path = StringVar()
    Application(top).mainloop()

就是上面这段代码，第76行的print(a)无法输出数据，但下面的print(b)却能输出，为什么？
像如图所示的那样：

wkfy

断点看看a有没有值。也许就是空值。

yunlongzhuhuo

wkfy 发表于 2022-2-25 10:51
断点看看a有没有值。也许就是空值。

我试了，下断点停不下来。
我用type(a)试了一下，什么也没返回

woflant

第45行改成：

[Python] 纯文本查看 复制代码

self.Text2 = Entry(self.top, textvariable=self.Text2Var, font=('Microsoft YaHei UI', 9))

需要绑定到Text2Var变量

zfb

根据你的思路，只需要把self.Text2Var变量成path即可，也就是
44行改为

[Python] 纯文本查看 复制代码

# self.Text2Var = StringVar()

46行改为

[Python] 纯文本查看 复制代码

self.Text2.setText = lambda x: path.set(x)

47行改为

[Python] 纯文本查看 复制代码

location = lambda : path.get()

yunlongzhuhuo

zfb 发表于 2022-2-25 11:41
根据你的思路，只需要把self.Text2Var变量成path即可，也就是
44行改为
[mw_shl_code=python,false]# sel ...

感谢感谢，问题解决了