Python 窗体(tkinter)下拉列表框(Combobox)实例

废话不多说，看代码吧！

import tkinter
from tkinter import ttk

def go(*args):  #处理事件，*args表示可变参数
 print(comboxlist.get()) #打印选中的值

win=tkinter.Tk() #构造窗体
comvalue=tkinter.StringVar()#窗体自带的文本，新建一个值
comboxlist=ttk.Combobox(win,textvariable=comvalue) #初始化
comboxlist["values"]=("1","2","3","4")
comboxlist.current(0) #选择第一个
comboxlist.bind("<<ComboboxSelected>>",go) #绑定事件,(下拉列表框被选中时，绑定go()函数)
comboxlist.pack()

win.mainloop() #进入消息循环

补充知识：Python GUI 之 Combobox 学习

1. 序言

本章介绍tkinter.ttk的Combobox控件。

2. 环境信息

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本系列运行平台：Windows10 64bit
Python 版本：3.7
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3. Combobox

Combobox为下拉列表控件，它可以包含一个或多个文本项(text item)，可以设置为单选或多选。使用方式为ttk.Combobox(root,option...)。

常用的参数列表如下：

一些常用的函数：

事件：

下拉列表没有command函数（方法)。

下拉列表的虚拟事件是 "<<ComboboxSelected>>"。

4. 实例

实例1

from tkinter import *
from tkinter import ttk

#Create an instance
win = Tk()
win.title("Learn Combobox")

#create a Label
lb1 = Label(win, text = "Below is a combobox 1", font = "tahoma 12 normal")
lb1.grid(column = 0, row = 0, padx = 8, pady = 4)

def show_select_1():
print("post_command: show_select")
print(value.get())

#Define tkinter data type
data = ["a","b","c"]
value = StringVar()

#Create a combobox, and tighter it to value
cbx_1 = ttk.Combobox(win, width = 12, height = 8, textvariable = value, postcommand = show_select_1)
cbx_1.grid(column = 0, row = 1)

#add data to combobox
cbx_1["values"] = data

#======================================================================================================
#create a Label
lb2 = Label(win, text = "Below is a combobox 2", font = "tahoma 12 normal")
lb2.grid(column = 0, row = 4, padx = 8, pady = 4)

def show_data_2(*args):
print("Event: ComboboxSelected")
print(cbx_2.get())

#Define tkinter data type
data2 = ["a2","b2","c2","d2","e2"]

#Create a combobox, and tighter it to value
cbx_2 = ttk.Combobox(win, width = 12, height = 8)
cbx_2.grid(column = 0, row = 5)

#set cbx_2 as readonly
cbx_2.configure(state = "readonly")

#add data to combobox
cbx_2["values"] = data2
#set the initial data [index =2] to shows up when win generated
cbx_2.current(2)

#bind a event
cbx_2.bind("<<ComboboxSelected>>", show_data_2)

win.mainloop()

来源：https://blog.csdn.net/houyanhua1/article/details/78174066