tkinter label怎么在运行后重新赋值

Question

        addr_num = tk.StringVar()
        addr_num.set(len(v_url))
        tk.Label(win,textvariable=commend_num,width=5,height=1,bg='blue').grid(row=2,column=2)

addr_num.set(len(v_url))这个数值，会在窗口启动时显示出来，
但窗口启动后，这个值改变了，怎么label更新呢

Answer 1

addr_num = tk.StringVar()
addr_num.set(len(v_url))
tk.Label(win,textvariable=addr_num,width=5,height=1,bg='blue').grid(row=2,column=2) #修改textvariable属性

----当需要更新时-------

addr_num.set(len(v_url)) #再调用一次就可以