使用 tkinter 和列表框的 Python 无法获取按钮来提供答案

Question

使用 python 3.6、tkinter 和 mathplotlib。

创建了一个列表框，但我无法弄清楚如何让每个按钮返回不同的图形。

已创建框

window.title( 'Employee Selection' )
frame = Frame( window )
listbox = Listbox( frame )
listbox.insert( 1 , '1')
listbox.insert( 2 , '2')
listbox.insert( 3, '3')
listbox.insert( 4, '4')
listbox.pack()

我用这个

listbox.bind('<<ListboxSelect>>', immediately)
print(listbox.get(ACTIVE))

我如何做到这一点，当单击box 1它选择运行一件事时 以及它选择运行另一个box 2...

这是整件事

import matplotlib.pyplot as plt
from tkinter import *
import tkinter.messagebox as box

# data to plot
n_groups = 4
scores_1 = (10,8,6,7)
scores_4 = (7,6,6,7)
scores_2 = (9,9,8,10)
scores_3 = (6,5,7,5)

def immediately(e):
# create plot
fig, ax = plt.subplots()
index = np.arange(n_groups)
bar_width = 0.35
opacity = 0.8

rects1 = plt.bar(index, 1, bar_width,
alpha=opacity,
color='b',
label='Joe')
plt.xlabel('Person')
plt.ylabel('Rating')
plt.title('Performance Ratings')
plt.xticks(index + bar_width, ('Q1', 'Q2', 'Q3', 'Q4'))
plt.legend()

plt.tight_layout()
plt.show()


window = Tk()
window.title( 'Employee Selection' )
frame = Frame( window )
listbox = Listbox( frame )
listbox.insert( 1 , '1')
listbox.insert( 2 , '2')
listbox.insert( 3, '3')
listbox.insert( 4, '4')
listbox.pack()
btn = Button( frame , text = 'Select')
btn.pack( side = RIGHT , padx = 5)
listbox.pack( side = LEFT )
frame.pack( padx = 70 , pady = 30 )

listbox.bind('<<ListboxSelect>>', immediately)
print(listbox.get(ACTIVE))
mainloop()

按钮 1 是硬编码的，因为我无法弄清楚如何选择其他按钮

Answer 1

你必须在函数中获取值

，并与<<ListboxSelect>>绑定

import tkinter as tk
# --- function ---
def on_selection(event):
# here you can get selected element
print('previous:', listbox.get('active'))
print(' current:', listbox.get(listbox.curselection()))
# or using `event`
#print('event:', event)
#print('widget:', event.widget)
print('(event) previous:', event.widget.get('active'))
print('(event)  current:', event.widget.get(event.widget.curselection()))
print('---')
# --- main ---
root = tk.Tk()
listbox = tk.Listbox(root)
listbox.pack()
listbox.insert(1, 'Hello 1')
listbox.insert(2, 'Hello 2')
listbox.insert(3, 'Hello 3')
listbox.insert(4, 'Hello 4')
listbox.bind('<<ListboxSelect>>', on_selection)
root.mainloop()