python tkinter 下拉框（Combobox）

代码示例：

import tkinter as tk #GUI库
from tkinter import ttk
class test():
    def __init__(self,win,PHYSN_TYPE,POS_NAME):
    	self.win=win
    	self.PHYSN_TYPE=PHYSN_TYPE
    	self.POS_NAME=POS_NAME
	def my_GUI(self):
		tk.Label(self.win, text='机具类型：', bd=3, relief='groove', width=16,anchor='e').grid(row=2,column=2,padx=5)
        number = tk.StringVar()  #是否选中
        valus = ['mpos', '大POS', '电蓝POS', '经典蓝POS']  #选项值设置
        self.PHYSN_TYPE = ttk.Combobox(self.win, width=16,height=4, textvariable=number ,state='readonly')# 高度,下拉显示的条目数量
        self.PHYSN_TYPE.grid(row=2, column=3,columnspan=3)
        self.PHYSN_TYPE['values']=valus  
        self.PHYSN_TYPE.current(1)  # 设置下拉列表默认显示的值
        self.PHYSN_TYPE.bind('<<ComboboxSelected>>', self.Chosen)  #绑定选项（输出选中内容）
        print(self.PHYSN_TYPE.current(),self.PHYSN_TYPE.get()) #输出选项内容
        
        tk.Label(self.win, text='机具名称：', bd=3, relief='groove', width=16,anchor='e').grid(row=3,column=2,padx=5)
        number1 = tk.StringVar()
        valus2 = ['00-小蓝(MPos)','01-小蓝-会员(Mpos)','02-大蓝(大Pos)','03-炫蓝(大Pos)','04-电蓝(EPos)','05-经典蓝(大Pos)',
                  '06:Epos(4G版本)','07:大Pos(4G版)','08:EPos-Plus','09:大机虎力版','10:epos(买断版)','11:大pos(买断版)','12:epos(买断版)']
        self.POS_NAME=ttk.Combobox(self.win, width=16, textvariable=number1,height=5,values=valus2,state='readonly')
        self.POS_NAME.grid(row=3, column=3,columnspan=3)
        #self.POS_NAME.current(10)  #设置下拉框内默认显示第10个选择（10为values的下标值）
        number1.set('09:大机虎力版')   #设置下拉框内默认显示内容
        print(self.POS_NAME.current(), self.POS_NAME.get())
        self.POS_NAME.bind('<<ComboboxSelected>>', self.Chosen2)
   	#打印选项内容
     def Chosen(self,event):
        print('机具类型：',self.PHYSN_TYPE.get())
        print('机具类型：',self.PHYSN_TYPE.current())
        print('机具名称：', self.POS_NAME.current())
        #-----机具类型关联机具名称选项框
        if self.PHYSN_TYPE.current()==0:
            self.POS_NAME.configure(values=['00-小蓝(MPos)','01-小蓝-会员(Mpos)'])
            self.POS_NAME.current(0)
        elif self.PHYSN_TYPE.current()==1:
            self.POS_NAME.configure(values=['02-大蓝(大Pos)','03-炫蓝(大Pos)','07:大Pos(4G版)','09:大机虎力版','11:大pos(买断版)'])
            self.POS_NAME.current(0)
        elif self.PHYSN_TYPE.current()==2:
            self.POS_NAME.configure(values=['04-电蓝(EPos)','06:Epos(4G版本)', '08:EPos-Plus','12:epos(买断版)'])
            self.POS_NAME.current(0)
        elif self.PHYSN_TYPE.current()==3:
            self.POS_NAME.configure(values=['05-经典蓝(大Pos)'])
            self.POS_NAME.current(0)
    def Chosen2(self,event):
        print('机具名称：',self.POS_NAME.get())
        print('机具名称：',self.POS_NAME.current())
win = tk.Tk()  # 创建窗口
win.geometry('600x400')  # 设置窗口大小
# win.config(background='pink')
win.title("TEST")  # 创建窗口标题
test(win,None,None).my_GUI()
win.mainloop()  #运行

效果如下图所示：