Combobox问题

Question

请原谅我的绿色。正在尝试构建从组合框中选择的选项填充文本框的GUI。什么都没发生。第一次编程所以很感激我在这里犯了很多错误。你知道吗

import tkinter as tk
from tkinter import ttk
from tkinter import scrolledtext

# function to display course selected
def courseDisplay():
    box = course.get() 
    print(box)

# Create instance
win = tk.Tk() 
win.resizable(130,130)   
win.title("RaceCourse GUI")

# create combobox
course = tk.StringVar()
courseChosen = ttk.Combobox(win,width=60,textvariable=course,state='readonly')   
courseChosen['values'] = ("Choose a course","Ascot", "Bath", "Chester")
courseChosen.grid(column=5, row=1,rowspan = 3, columnspan = 3,padx = 300, pady = 40)
courseChosen.current(0)
courseChosen.bind("<<ComboboxSelected>>", courseDisplay)

# create scrolled Text control    
scrolW  = 46
scrolH  =  10
box = scrolledtext.ScrolledText(win, width=scrolW, height=scrolH, wrap=tk.WORD)
box.grid(column=5, row=8, columnspan=3,padx = 300,pady = 10)

# Start GUI

win.mainloop()

Answer 1

由于函数courseDisplay是在combobox上发生某个事件时（即选择某个选项时）调用的，因此它应该接受一个变量（通常称为event）。所以，你的函数应该是这样的：

def courseDisplay(event=None):
    box = course.get() 
    print(box)

当然，您应该添加另一个逻辑来在文本框中显示test，而不是print。你知道吗