python - 如何使用单选按钮为 Python 中的变量赋值？

Question

我正在尝试使用 python 中的单选按钮为变量赋值，代码如下：

def print_me():
global payment
global membership

if studentMemString == "PY_VAR0":
    membership = "STUDENT"
    payment = studentMem
elif adultMemString == "PY_VAR10":
    membership = "ADULT"
    payment = adultMem
elif childMemString == "PY_VAR0":
    membership = "CHILD"
    payment = childMem
else:
    pass
print(membership)
print(payment)


root = tk.Tk()
studentMem = tk.StringVar()
studentMemString = str(studentMem)

adultMem = tk.StringVar()
adultMemString = str(adultMem)

childMem = tk.StringVar()
childMemString = str(childMem)


studentRadBtn = tk.Radiobutton(root, text="Student - £19.99", 
variable=studentMem, value= 19.99)
studentRadBtn.pack()
adultRadBtn = tk.Radiobutton(root, text="Adult - £34.99", variable=adultMem, 
value= 34.99)
adultRadBtn.pack()
childRadBtn = tk.Radiobutton(root, text="Child - £5.99", variable=childMem, 
value=5.99)
childRadBtn.pack()

button = tk.Button(root, text="click", command=print_me)
button.pack()

root.mainloop()

（更新）好的，所以现在的问题是，当我启动程序时，所有单选按钮都处于活动状态，无论我尝试单击哪个单选按钮，唯一被调用的单选按钮是第一个。为什么都被选中？

Answer 1

在下面的代码中，单选按钮在选择时更改变量的值v。的初始值为，v因此"2"默认选择第二个单选按钮。

import tkinter as tk

root = tk.Tk()

v = tk.StringVar()
v.set("2")

tk.Label(root, textvariable=v).pack()

tk.Radiobutton(root, text="one", variable=v, value="1").pack()
tk.Radiobutton(root, text="two", variable=v, value="2").pack()
tk.Radiobutton(root, text="three", variable=v, value="3").pack()

root.mainloop()