Display more than one button in GUI to display MPU6000 Sensor readings

[jenkins43]

Hi, As you mentioned I optimize the code accordingly but I am still not able to destroy the button after the click, I guess I am not placing the option correctly please check out my code :

import serial
import json
import tkinter
from tkinter import messagebox
from tkinter import *
import tkinter as ttk
import serial.tools.list_ports

root = ttk.Tk()
root.title("Read Sensor")

ard = serial.Serial('COM4', timeout=1); 

# Add a grid
mainframe = Frame(root)
mainframe.grid(column=0,row=0, sticky=(N,W,E,S) )
mainframe.columnconfigure(0, weight = 1)
mainframe.rowconfigure(0, weight = 1)
mainframe.pack(pady = 100, padx = 100)
 
# Create a Tkinter variable
tkvar = StringVar(root)
 
# Dictionary with options
baud = { '9600','119200','34800'}
tkvar.set('9600') # set the default option

#Pop Up desciption
popupMenu = OptionMenu(mainframe, tkvar, *baud)
Label(mainframe, text="Baudrate").grid(row = 1, column = 1)
popupMenu.grid(row = 2, column =1)

#baudrate functions
def dropCall(*args):
   B = None
   value = tkvar.get()
   ## using a dictionary instead of if statements
   ## to show how dictionaries are used
   baud_dict={'9600':value, '34800':value, '119200':value}
   if value in baud_dict:
       ard.baudrate = int(baud_dict[value])
       if B:
           B.destroy()
       B = ttk.Button(root, text =value, command = helloCallBack)
       B.pack()   
    
#Link Function
tkvar.trace('w', dropCall)

    
#Serial Callback Functions
def helloCallBack():
    k = ard.readline().decode('ascii');
    if(len(k)>0):
        print (k);
        size = len(k);
        #print (k[0:size-2]);
        print (size);
        messagebox.showinfo('Message From Arduino',k[0:size-2]+'\n'+str(size))