python tkinter updating the combo box programmatically

Question

When I print the list that I am setting the Combobox to I am getting an updated list based on the available com ports, however the values in the drop down box are not working. I have a feeling that it is because I am using customtkinter.... I really hope not. Does anyone see what is happening here?

import customtkinter
from ConnexLink import findcomports, recievesignal, closeserialport
import serial

customtkinter.set_appearance_mode("light")  # Modes: "System" (standard), "Dark", "Light"
customtkinter.set_default_color_theme("blue")  # Themes: "blue" (standard), "green", "dark-blue"

app = customtkinter.CTk()
app.geometry("500x500")
app.title("Connex Link")

def runfindcomports(afterfirstrun=True):
  ports=[]
  for info in serial.tools.list_ports.comports():
      port1=str(info)#sets the com port to port1
      ports.append(port1[0:4])
  if afterfirstrun:
    combobox_1['values']=ports
    print('why is it not working')
    print(ports)
  return(ports)
ports=runfindcomports(False)

onoroff = False
def onswitch():
  global onoroff
  global ser
  if onoroff:
    onoroff=False
    ser.close()
  else:
    onoroff=True
    print('on')
    ser = serial.Serial(combobox_1.get(),9600,timeout=2)  # open serial port
    
  
frame_1 = customtkinter.CTkFrame(master=app)
frame_1.pack(pady=20, padx=60, fill="both", expand=True)

label_1 = customtkinter.CTkLabel(master=frame_1, justify=customtkinter.LEFT,text='Vibrac')
label_1.pack(pady=10, padx=10)

combobox_1 = customtkinter.CTkComboBox(frame_1)
combobox_1.pack(pady=10, padx=10)
combobox_1.set("Select Com Port")
combobox_1['values']=ports

switch_1 = customtkinter.CTkSwitch(master=frame_1, command=onswitch,text='receive',)
switch_1.pack(pady=10, padx=10)

button_1 = customtkinter.CTkButton(master=frame_1, command=runfindcomports,text='refresh',)
button_1.pack(pady=10, padx=10)

text_1 = customtkinter.CTkTextbox(master=frame_1, width=300, height=300)
text_1.pack(pady=10, padx=10)

def textfilter(bytes):
  text=str(bytes)
  text=text[2:]
  text=text.split('\\',1)[0]
  return text

def printline():
  global onoroff
  if onoroff:
    line = ser.readline()
    if len(line) > 2:
      text_1.insert("end",textfilter(line)+'\n')
  app.after(500,printline)


app.after(500,printline)
app.mainloop()

Answer 1

It's a bug in CustomTkinter library. You can use configure() instead of __setitem__ like this.

combobox_1.configure(values=ports)

What about reporting this here? I'm not a CTk user or developer, but I analyzed the bug. The parameter lists of the configure() methods of the CTk widgets do not conform to the convention of the tkinter base class, as you can see in this and this.