检索ttk.combobox的选定值

from tkinter import *
from tkinter import ttk

root = Tk()
combo = ttk.Combobox(root)

combo['values'] = ('Option 1', 'Option 2', 'Option 3')

selected_value = combo.get()

from tkinter import *
from tkinter import ttk

def get_selected_value():
    selected_value = combo.get()
    print(selected_value)

root = Tk()
combo = ttk.Combobox(root)
combo['values'] = ('Option 1', 'Option 2', 'Option 3')
combo.pack()

button = Button(root, text="Get Selected Value", command=get_selected_value)
button.pack()

root.mainloop()