Detailed example of Python simple serial port send and receive GUI interface

I have been busy for more than 3 hours and have been working together for more than 3 hours. Finally, I have come up with an GUI interface for PC machine with basic serial communication functions. Tkinter is really useful in python, and the amount of code is really small. The insufficiency is that Tkinter does not bring combox with it. Fortunately, the version 2.7 that I downloaded has its own ttk module with combox, so the problem is solved smoothly.

The following is the source code, some error alert functions have not been done, at present, only the communication interface between the lower computer and PC is simply implemented, the lower computer is still using STM32F103

#encoding=utf-8
__author__ = 'freedom'
 
from Tkinter import *
from serial import *
import ttk
 
class GUI(Frame):
  def __init__(self,master):
    frame = Frame(master)
    frame.pack()
    # Serial Port Setting Related Variables 
    self.port = 0
    self.baudrate = 9600
    # Serial slogan prompt 
    self.lab1 = Label(frame,text = 'Serial Number')
    self.lab1.grid(row = 0,column = 0,sticky = W)
    # Serial Password Selection Dropdown Menu 
    self.boxValue = StringVar()
    self.boxChoice = ttk.Combobox(frame,textvariable = self.boxValue,state = 'readonly')
    self.boxChoice['value'] = ('COM1','COM2','COM3','COM4')
    self.boxChoice.current(0)
    self.boxChoice.bind('<<ComboboxSelected>>',self.Choice)
    self.boxChoice.grid(row = 1,column = 0,sticky = W)
    # Baud Rate Selection Tips 
    self.lab2 = Label(frame,text = 'Baudrate Set')
    self.lab2.grid(row = 2,column = 0,sticky = W)
    # Baud Rate Selection Dropdown Menu 
    self.boxValueBaudrate = IntVar()
    self.BaudrateChoice = ttk.Combobox(frame,textvariable = self.boxValueBaudrate,state = 'readonly')
    self.BaudrateChoice['value'] = (9600,115200)
    self.BaudrateChoice.current(0)
    self.BaudrateChoice.bind('<<ComboboxSelected>>',self.ChoiceBaudrate)
    self.BaudrateChoice.grid(row = 3,column = 0,sticky = W)
    # Output box prompt 
    self.lab3 = Label(frame,text = 'Message Show')
    self.lab3.grid(row = 0,column = 1,sticky = W)
    # Output Box 
    self.show = Text(frame,width = 40,height = 5,wrap = WORD)
    self.show.grid(row = 1,column = 1,rowspan = 4,sticky = W)
    # Input box prompt 
    self.lab4 = Label(frame,text = 'Input here,please!')
    self.lab4.grid(row = 5,column = 1,sticky = W)
    # Input Box 
    self.input = Entry(frame,width = 40)
    self.input.grid(row = 6,column = 1,rowspan = 4,sticky = W)
    # Input Button 
    self.button1 = Button(frame,text = "Input",command = self.Submit)
    self.button1.grid(row = 11,column = 1,sticky = E)
    # Serial Open Button 
    self.button2 = Button(frame,text = 'Open Serial',command = self.open)
    self.button2.grid(row = 7,column = 0,sticky = W)
    # Serial port close button 
    self.button3 = Button(frame,text = 'Close Serial',command = self.close)
    self.button3.grid(row = 10,column = 0,sticky = W)
    # Serial information prompt box 
    self.showSerial = Text(frame,width = 20,height = 2,wrap = WORD)
    self.showSerial.grid(row = 12,column = 0,sticky = W)
    # Serial Initialization Configuration 
    self.ser = Serial()
    self.ser.setPort(self.port)
    #self.ser.setBaudrate(self.baudrate)
    #self.ser.open()
    #print self.ser.isOpen()
    #print self.ser
  def Choice(self,event):
    context = self.boxValue.get()
    list = ["COM1",'COM2','COM3','COM4']
    if context in list:
      self.port = list.index(context)
      self.ser.setPort(self.port)
    print self.port
  def ChoiceBaudrate(self,event):
    self.baudrate = self.boxValueBaudrate.get()
    self.ser.setBaudrate(self.baudrate)
    print self.baudrate
  def Submit(self):
    context1 = self.input.get()
    n = self.ser.write(context1)
    output = self.ser.read(n)
    print output
    self.show.delete(0.0,END)
    self.show.insert(0.0,output)
  def open(self):
    self.ser.open()
    if self.ser.isOpen() == True:
      self.showSerial.delete(0.0,END)
      self.showSerial.insert(0.0,"Serial has been opend!")
  def close(self):
    self.ser.close()
    if self.ser.isOpen() == False:
      self.showSerial.delete(0.0,END)
      self.showSerial.insert(0.0,"Serial has been closed!")
root = Tk()
root.title("Serial GUI")
#root.geometry("3000x4000")
app = GUI(root)
root.mainloop()