from tkinter import *
t=Tk()
t.title("复选框")
t.geometry("300x300")
def f():
a=v.get()
l1.config(text=a)
v=IntVar()
v.set(0)
c1=Checkbutton(t,text="选择",variable=v,onvalue=1,offvalue=0,command=f)
c1.pack()
l1=Label(t,text="0",fg="red")
l1.pack()
t.mainloop()