动态菜单选项卡 Tkinter - 串行端口选择

Question

I would like to create an application with Tkinter, where serialports can be selected via the menu tabs. So the programm is searching for Ports and creates Tabs in the menu accordingly. If I am clicking on a Port it should give me back the port that were selected.

Usually this isn't a problem, if the exact amount of tabs is known and you just can initialise each tab singularly. I have tried to create a function that is being called with a parameter(name of label), when ever a label is clicked:

import serial.tools.list_ports
from tkinter import *

def getPorts():
       return list(serial.tools.list_ports.comports())

def selectPort(port):
        print(port)
        #do port selection


root = Tk()

#Menu bar-------------
menu_bar = Menu(root)

#main tab: Tool 
Tools_menuTab =Menu(menu_bar, tearoff=0)
menu_bar.add_cascade(label='Tools', menu=Tools_menuTab)

#sub tab: Port
Tool_portSub = Menu(Tools_menuTab, tearoff=0)
Tools_menuTab.add_cascade(label='Port: ', menu=Tool_portSub)

#ports
portList = getPorts()
for i in range(len(portList)):
    #pass a parameter with lambda
    Tool_portSub.add_command(label=str(portList[i]),command=lambda: selectPort(str(portList[i])))


root.config(menu=menu_bar)
root.mainloop()

On whatever label I am clicking, it only prints the last port.

I would appreciate any help.

Answer 1

Used default keyword parameters in lambda functions to "store" the parameters according to the label name. Changed to:

port = str(portList[i])
Tool_portSub.add_command(label=port,command=lambda port=port: selectPort(port))