Tkinter 跟踪方法在预期为 0 时返回 3 个变量

Question

我正在尝试制作一个动态 gui，根据组合框中选择的值更改其标签。我正在尝试使用 .trace 方法来完成此操作。我在当前设置中收到以下错误"area_labels需要 0 个位置参数，但给出了 3 个(

我在下面附加了代码的相关部分。

from tkinter import *
import tkinter as tk
from tkinter import ttk

window = Tk()
window.geometry('1300x700')
window.title('Volumetric Calculator')

areastcboxv = StringVar()
areastcbox = ttk.Combobox(window, textvariable = areastcboxv, values = ('Discrete','Normal','Truncated Normal', 'Log Normal'))
areastcbox.grid(row = 1, column = 2)
areastcbox.set('Discrete')
areastcboxv.trace("w", area_labels)
def area_labels():

if areastcboxv.get() == "Discrete":
lvlabel = Label(text = 'Base Case Value', fg = 'black', bg = 'white', width = 17 ).grid(row = 0, column = 3)
bvlabel = Label(text = 'Standard Dev', fg = 'black', bg = 'white', width = 17 ).grid(row = 0, column = 4)
hvlabel = Label(text = 'High Value', fg = 'black', bg = 'white', width = 17).grid(row = 0, column = 5)
lplabel = Label(text = 'Low Probability', fg = 'black', bg = 'white', width = 17).grid(row = 0, column = 6)
bplabel = Label(text = 'Base Probability', fg = 'black', bg = 'white', width = 17).grid(row = 0, column = 7)
hplabel = Label(text = 'High Probability', fg = 'black', bg = 'white', width = 17, state = DISABLED ).grid(row = 0, column = 8)
elif areastcboxv.get() == "Normal":
lvlabel = Label(text = 'Base Case Value', fg = 'black', bg = 'white', width = 17 ).grid(row = 0, column = 3)
bvlabel = Label(text = 'Standard Dev', fg = 'black', bg = 'white', width = 17 ).grid(row = 0, column = 4)
hvlabel = Label(text = 'High Value', fg = 'black', bg = 'white', width = 17, state = DISABLED ).grid(row = 0, column = 5)
lplabel = Label(text = 'Low Probability', fg = 'black', bg = 'white', width = 17, state = DISABLED ).grid(row = 0, column = 6)
bplabel = Label(text = 'Base Probability', fg = 'black', bg = 'white', width = 17, state = DISABLED ).grid(row = 0, column = 7)
hplabel = Label(text = 'High Probability', fg = 'black', bg = 'white', width = 17, state = DISABLED ).grid(row = 0, column = 8)
elif areastcboxv.get() == "Truncated Normal":
pass
elif areastcboxv.get() == "Log Normal":
pass
window.mainloop()

Answer 1

跟踪将提供三个参数。 将函数更改为 area_labels(*事件( 或 area_labels(a，b，c(

在这里寻找解释 Tkinter 变量跟踪方法回调的参数是什么？

import tkinter as tk
from tkinter import ttk
def selection(*trace_event):
print('the trace arguments',trace_event)
chosen['text'] = options.get()
ROOT = tk.Tk()
val = tk.StringVar()
options = ttk.Combobox(textvariable=val,
values=('a','b','c'))
options.grid()
val.trace('w', selection)
chosen = tk.Label(text='No selection')
chosen.grid()
ROOT.mainloop()