I'm having trouble adding items to a combobox with a textbox and pushboton in GUIzero

Question

I'm trying to add items to the combobox in GUIzero getting the value from a textbox when a button is pressed, but when the button is pressed I get the following error:

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\Alfonso\AppData\Local\Programs\Python\Python313\Lib\tkinter\__init__.py", line 2068, in __call__
    return self.func(*args)
           ~~~~~~~~~^^^^^^^
  File "C:\Users\Alfonso\AppData\Local\Programs\Python\Python313\Lib\site-packages\guizero\PushButton.py", line 206, in _command_callback
    self._command()
    ~~~~~~~~~~~~~^^
TypeError: 'str' object is not callable

this is the part of my code that it is giving my issues:

from guizero import App, Box, Text, PushButton, ListBox, Window, TextBox, Combo

def add_team():
    n = t_names.value
    l_team.append(n)
    
def edit_menu():
    edit_win.show(wait=True)
    
app = App(title = "Timer", layout = "grid", bg="Gray")
bot = PushButton(app, text="edit", grid=[0,0], command="edit_menu")

edit_win = Window(app, title="Edit", layout="grid", bg="Gray")              #edit window
team_name = Text(edit_win, grid=[0,0], text="Teams:", size=30)
l_team = Combo(edit_win, options=[" "], grid=[1,0])
l_team.text_size=30
t_names = TextBox(edit_win, grid=[2,0], width=40)
mas_team = PushButton(edit_win, grid=[3,0], text="Add", command="add_team")
menos_team = PushButton(edit_win, grid=[4,0], text="Del", command="del_team")
edit_win.tk.state("zoomed")
edit_win.hide()

I think that I have a problem with my Tkinter library.

You are passing a string to the command args of your buttons instead of passing the function you want to call. That will lead to the error as strings are not callable. — l4mpi
– l4mpi, Commented Oct 16 at 7:59
command=edit_menu without " " - and this how you send functions in GUIs and in many other situations. — furas
– furas, Commented Oct 19 at 2:09

Bryan Oakley · Accepted Answer · 2025-10-21 13:39:47Z

1

The problem originates from this line of code:

bot = PushButton(app, text="edit", grid=[0,0], command="edit_menu")

"edit_menu" is a string, so when you click the button the code tries to call the string rather than a function with the name in the string. It's no different then if you wrote code that looks like "edit_menu"().

When defining commands, you must define it with an actual command. Since the command is edit_menu, that's what you set the command option to:

bot = PushButton(app, text="edit", grid=[0,0], command=edit_menu)

answered Oct 21 at 13:39

Bryan Oakley

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