如何在python中使用Tkinter生成3（或4）个嵌套的绑定组合？

我正在尝试制作一个GUI，它具有依赖于上一个下拉列表的绑定下拉列表。我试图实现的格式如下：

选择一个{level 1}

选择一个绑定到级别1的{level 2}

选择一个绑定到级别2的{level 3}

选择一个绑定到级别3的{level 4}

我一直在研究的代码如下所示。这源自：

---

这里有一个解决方案，您也可以通过添加邮政编码来进一步改进

import tkinter as tk
from tkinter import ttk

cars = {"Bugatti":["Veyron","Golf"] ,"BMW":["330M"]}
    

def change_dropdown(*args):

    print("Chosen brand " + tkvar.get())

    for x, y in cars.items():
        if tkvar.get() == x:
            tkvar2.set(y[0])
            popupMenu2.configure(values=y)
        
     
root = tk.Tk()
canvas = tk.Canvas(root, height=500, width= 500, bg="white")
canvas.pack()

tkvar = tk.StringVar(root)

tkvar2 = tk.StringVar(root)

tkvar3 = tk.StringVar(root)

popupMenu1 = ttk.Combobox(canvas, textvariable=tkvar, values=list(cars.keys()))
popupMenu1.pack()
popupMenu1.bind('<<comboboxselected>>', change_dropdown)

popupMenu2 = ttk.Combobox(canvas, textvariable=tkvar2, values=[])
popupMenu2.pack()
popupMenu1.bind('<<comboboxselected>>', change_dropdown)

popupMenu3 = ttk.Combobox(canvas, textvariable=tkvar3, values=[])
popupMenu3.pack()

root.mainloop()

---

那么你的问题到底是什么呢？

state

和

CBSA

之间，以及

CBSA

和

Zip

之间没有联系。那么

CBSA

如何依赖于

state

，以及

Zip

如何依赖于

CBSA

？基于更接近工作模型的更新问题，更符合我的总体设计。需要看到“Zip”条目根据第二个下拉列表的选择填充到第三个下拉列表中。这就是我需要帮助的地方。谢谢@JacksonPro！这很有帮助。我不得不做一些轻微的修改，为第三个下拉选项提供多个选项；例如：_-zip=[[[“TEST1”]、[“TEST11”]、[[“TEST2”]、[“Hello”]、[“World”]、[“TEST3”]。但这有助于我了解我正在寻找的总体结构；请参阅原始帖子中的更新部分。我需要说明网格的位置，这是我通过调整答案完成的。@andrewhick您需要给行和列的权重1:

tk.grid.rowconfigure（root，（0,1,2），weight=1）tk.grid.columnconfigure（root，（0,1,2），weight=1）

，这有助于根据窗口大小将它们隔开并调整大小？那太好了！谢谢@安德烈：这对我来说很好。我没有使用jupyter笔记本，所以我不确定问题出在哪里。

import tkinter as tk
from tkinter import ttk



cars = {"Bugatti":["Veyron","Golf"] ,"BMW":["330M"]}

_zip = [[["TEST1"],["TEST11"]],[["TEST2"],["Hello"],["World"]],["TEST3"]]

lst = [x for y in list(cars.values()) for x in y]


def change_dropdown(*args):

    print("Chosen brand " + tkvar.get())

    if args[0] == 'PY_VAR0':
        for x, y in cars.items():
            if tkvar.get() == x:
                tkvar2.set(y[0])
                popupMenu2.configure(values=y)
        
    if args[0] == 'PY_VAR1':
        for x, y in zip(lst, _zip):
            if tkvar2.get() == x:            
                tkvar3.set(y[0])
                popupMenu3.configure(values=y)
        
    return
    
root = tk.Tk()
# canvas = tk.Canvas(root, height=500, width= 500, bg="white")
root.geometry('500x100')
font = ("Courier", 16, "bold")
# canvas.pack()

tkvar = tk.StringVar(root)
tkvar.trace('w', change_dropdown)

tkvar2 = tk.StringVar(root)
tkvar2.trace('w', change_dropdown)

tkvar3 = tk.StringVar(root)

labelTop = tk.Label(root, text = "Select a State")
labelTop.grid(column=0, row=0)
popupMenu1 = ttk.Combobox(root, textvariable=tkvar, values=list(cars.keys()))
popupMenu1.grid(row=0, column=1)
# popupMenu1.pack()

popupMenu2 = ttk.Combobox(root, textvariable=tkvar2, values=[])
popupMenu2.grid(row=1, column=1)
# popupMenu2.pack()

popupMenu3 = ttk.Combobox(root, textvariable=tkvar3, values=[])
popupMenu3.grid(row=2, column=1)
# popupMenu3.pack()

root.mainloop()

import tkinter as tk
from tkinter import ttk

cars = {"Bugatti":["Veyron","Golf"] ,"BMW":["330M"]}
    

def change_dropdown(*args):

    print("Chosen brand " + tkvar.get())

    for x, y in cars.items():
        if tkvar.get() == x:
            tkvar2.set(y[0])
            popupMenu2.configure(values=y)
        
     
root = tk.Tk()
canvas = tk.Canvas(root, height=500, width= 500, bg="white")
canvas.pack()

tkvar = tk.StringVar(root)

tkvar2 = tk.StringVar(root)

tkvar3 = tk.StringVar(root)

popupMenu1 = ttk.Combobox(canvas, textvariable=tkvar, values=list(cars.keys()))
popupMenu1.pack()
popupMenu1.bind('<<comboboxselected>>', change_dropdown)

popupMenu2 = ttk.Combobox(canvas, textvariable=tkvar2, values=[])
popupMenu2.pack()
popupMenu1.bind('<<comboboxselected>>', change_dropdown)

popupMenu3 = ttk.Combobox(canvas, textvariable=tkvar3, values=[])
popupMenu3.pack()

root.mainloop()

import tkinter as tk
from tkinter import ttk

cars = {"Bugatti":["Veyron","Golf"] ,"BMW":["330M"]}

_zip = [["TEST1"],["TEST2"],["TEST3"]]

lst = [x for y in list(cars.values()) for x in y]


def change_dropdown(*args):

    print("Chosen brand " + tkvar.get())

    if args[0] == 'PY_VAR0':
        for x, y in cars.items():
            if tkvar.get() == x:
                tkvar2.set(y[0])
                popupMenu2.configure(values=y)
        
    if args[0] == 'PY_VAR1':
        for x, y in zip(lst, _zip):
            if tkvar2.get() == x:            
                tkvar3.set(y[0])
                popupMenu3.configure(values=y)
        
    return
    
root = tk.Tk()
canvas = tk.Canvas(root, height=500, width= 500, bg="white")
canvas.pack()

tkvar = tk.StringVar(root)
tkvar.trace('w', change_dropdown)

tkvar2 = tk.StringVar(root)
tkvar2.trace('w', change_dropdown)

tkvar3 = tk.StringVar(root)

popupMenu1 = ttk.Combobox(canvas, textvariable=tkvar, values=list(cars.keys()))
popupMenu1.pack()

popupMenu2 = ttk.Combobox(canvas, textvariable=tkvar2, values=[])
popupMenu2.pack()

popupMenu3 = ttk.Combobox(canvas, textvariable=tkvar3, values=[])
popupMenu3.pack()

root.mainloop()