Tkinter（四）：Radiobutton

import tkinter as tk

# 定义窗口
window = tk.Tk()
window.title(‘my window‘)  # 窗口title
window.geometry(‘350x300‘)  # 窗口尺寸

# 定义Label
l = tk.Label(window, bg="yellow", width=20,text=‘you have selected A‘)
l.pack()


def print_selection():
    # 改变L参数，r_value.get()获取共享变量的值
    l.config(text=‘you have selected ‘ + r_value.get())


# 定义Radiobutton
‘‘‘
text 代表显示的文字
variable,value表示，当被选中时，将value的值，赋值给variable
variable可以理解为同一个组中与其他radiobutton的共享变量
‘‘‘
r_value = tk.StringVar()
# 默认显示A选项
r_value.set(‘A‘)
r1 = tk.Radiobutton(window, text=‘Option A‘, variable=r_value, value=‘A‘, command=print_selection)
r1.pack()
r2 = tk.Radiobutton(window, text=‘Option B‘, variable=r_value, value=‘B‘, command=print_selection)
r2.pack()
r3 = tk.Radiobutton(window, text=‘Option C‘, variable=r_value, value=‘C‘, command=print_selection)
r3.pack()

window.mainloop()