从 tkinter 中的列表框小部件返回列表

Question

有人可以帮我解决这个问题。我将值从一个列表框传递到另一个列表框，然后在 tkinter 中再次返回，但我需要输出当前列表（右侧框中的值）。此框中的值将更改，因为它们可以移回原始框（左侧）。我曾尝试使用 return 语句返回当前列表，但一直没有打印出来

from tkinter import *

from tkinter import ttk

my_window = Tk()

my_frame_in = Frame(my_window)

my_frame_in.grid(row=0, column=0)

my_frame_out = Frame(my_window)

my_frame_out.grid(row=0, column=1)

listbox_events = Listbox(my_frame_in, height='5')

listbox_events.grid(row=0, column=0, padx=10, pady=10)

listbox_events_filtered = Listbox(my_frame_out, height='5')

listbox_events_filtered.grid(row=0, column=2, padx=(0, 10), pady=10)

my_instructions = Label(my_window, text='Use arrow keys to move selected items')

my_instructions.grid(row=1, column=0, columnspan=3, pady=(0, 10))

my_list_events = ['A', 'B', 'C', 'D']

for item in my_list_events:

    listbox_events.insert(END, item)

current_list = []

def select_events():

    listbox_events_filtered.insert(END, listbox_events.get(ANCHOR))

    listbox_events.delete(ANCHOR)

    current_list.append(ANCHOR)

    return current_list

def deselect_events(event=None):

    listbox_events.insert(END, listbox_events_filtered.get(ANCHOR))

    listbox_events_filtered.delete(ANCHOR)

# ref https://effbot.org/tkinterbook/tkinter-events-and-bindings.htm

listbox_events.bind('<Right>', select_events)

listbox_events.bind('<Left>', deselect_events)

for item in current_list:

    print(item)

mainloop()

Answer 1

此语句返回一个元组，其中包含第二个列表框中的所有值。listbox_events_filtered.get(0,END)但是，您的代码还存在许多其他问题：def select_events()也需要def select_events(event=None)您将错误的列表框绑定到取消选择事件；它应该是listbox_events_filtered.bind('<Left>', deselect_events)current_listin是select_events()局部变量，不影响current_list函数外部。current_list在结束时返回select_events()什么都不做，因为你没有将函数分配给任何东西。最后，for item in current_list:&nbsp; &nbsp; print(item)只会运行一次，因为mainloop()只会循环 tkinter 事件。考虑到所有这些，您应该将代码更改为以下内容：from tkinter import *from tkinter import ttkmy_window = Tk()my_frame_in = Frame(my_window)my_frame_in.grid(row=0, column=0)my_frame_out = Frame(my_window)my_frame_out.grid(row=0, column=1)listbox_events = Listbox(my_frame_in, height='5')listbox_events.grid(row=0, column=0, padx=10, pady=10)listbox_events_filtered = Listbox(my_frame_out, height='5')listbox_events_filtered.grid(row=0, column=2, padx=(0, 10), pady=10)my_instructions = Label(my_window, text='Use arrow keys to move selected items')my_instructions.grid(row=1, column=0, columnspan=3, pady=(0, 10))my_list_events = ['A', 'B', 'C', 'D']for item in my_list_events:&nbsp; &nbsp; listbox_events.insert(END, item)current_list = []def select_events(event=None):&nbsp; &nbsp; listbox_events_filtered.insert(END, listbox_events.get(ANCHOR))&nbsp; &nbsp; listbox_events.delete(ANCHOR)&nbsp; &nbsp; current_list.append(ANCHOR)&nbsp; &nbsp; for item in listbox_events_filtered.get(0,END):&nbsp; &nbsp; &nbsp; &nbsp; print(item)def deselect_events(event=None):&nbsp; &nbsp; listbox_events.insert(END, listbox_events_filtered.get(ANCHOR))&nbsp; &nbsp; listbox_events_filtered.delete(ANCHOR)&nbsp; &nbsp; for item in listbox_events_filtered.get(0,END):&nbsp; &nbsp; &nbsp; &nbsp; print(item)listbox_events.bind('<Right>', select_events)listbox_events_filtered.bind('<Left>', deselect_events)mainloop()希望这个答案可以让你解决你的问题:)