tkinter滚动条

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from tkinter import * import requests   window = Tk() window.geometry('1000x600+300+100') window.title('数据采集')   frame = Frame(window) frame.pack()   Label(frame,text='请输入网站地址：',font=('黑体',12)).pack()   var = StringVar() var.set('https://www.cnblogs.com/zhangyh-blog/p/15940602.html')   address = Entry(frame,width=70,textvariable=var) address.pack(pady=5)     # 创建一个滚动条 scroll_bar = Scrollbar(frame) scroll_bar.pack(side=RIGHT,fill=Y)     txt = Text(frame,width=120,height=30) txt.config(yscrollcommand=scroll_bar.set)  # 在Text组件中使用这个滚动条 txt.pack() scroll_bar.config(command=txt.yview)  # 让这个滚动条发挥作用     def submit():     addr = address.get()     res = requests.get(addr).text     global txt     txt.insert(INSERT,res)   def delete():     global txt     data = txt.get(1.0,END)       if len(data) > 1:         r = messagebox.askokcancel('提示','确定要清空全部数据吗？')         if r == True:             txt.delete(1.0,END)         else:             pass     else:         messagebox.showwarning('提示','数据为空，无需清空')     Button(frame,text='开始获取',command=submit).pack() Button(frame,text='清空数据',command=delete).pack()   from tkinter import messagebox def save():     global txt     result = txt.get(1.0,END)     with open('result.html','w',encoding='utf-8') as f:         f.write(result)     messagebox.showinfo('提示','已经将结果保存为 “result.html”文件，请前往查看')   Button(frame,text='保存',command=save).pack()     window.mainloop()