代码：

from tkinter import *
import requests


window = Tk()
window.geometry('500x350+500+100')
window.title('数据采集')

frame = Frame(window)
frame.pack()

Label(frame,text='请输入网站地址：').pack()
address = Entry(frame,width=50)
address.pack()

Label(frame,text='结果将在下方展示：').pack()
txt = Text(frame,height=10)
txt.pack()

def submit():
    global txt
    addr = address.get()
    res = requests.get(addr).text
    txt.insert(INSERT,res)

Button(frame,text='提交',command=submit).pack()

window.mainloop()

　　

效果：