Button object not callable in Tkinter

Question

I am trying to create a calculator app using Tkinter in python.
However, when I am trying to input my text in entry box i am getting the following error.

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:UsersOptimusanaconda3envsvirtual_enviournmentlibtkinter__init__.py", line 1892, in __call__
    return self.func(*args)
  File "C:UsersOptimusAppDataLocalTemp/ipykernel_2608/2120973008.py", line 18, in <lambda>
    button_7=Button(root, text="7", padx=40,pady=20, command=lambda: button_click(7))
TypeError: 'Button' object is not callable

my Code for the app is:

from tkinter import *
root=Tk()
root.title("Simple Calculator")
e=Entry(root, width=35, borderwidth=5)
e.grid(row=0, column=0, columnspan=3, padx=10, pady=10 )

def button_click(number):
    e.delete(0, END)
    e.insert(0, number)
    
#Define buttons
button_1=Button(root, text="1", padx=40,pady=20, command=lambda: button_click(1))
button_2=Button(root, text="2", padx=40,pady=20, command=lambda: button_click(2))
button_3=Button(root, text="3", padx=40,pady=20, command=lambda: button_click(3))
button_4=Button(root, text="4", padx=40,pady=20, command=lambda: button_click(4))
button_5=Button(root, text="5", padx=40,pady=20, command=lambda: button_click(5))
button_6=Button(root, text="6", padx=40,pady=20, command=lambda: button_click(6))
button_7=Button(root, text="7", padx=40,pady=20, command=lambda: button_click(7))
button_8=Button(root, text="8", padx=40,pady=20, command=lambda: button_click(8))
button_9=Button(root, text="9", padx=40,pady=20, command=lambda: button_click(9))
button_0=Button(root, text="0", padx=40,pady=20, command=lambda: button_click(0))
button_click=Button(root, text="+", padx=40,pady=20, command=lambda: button_click())
button_equals=Button(root, text="=", padx=120,pady=20, command=lambda: button_click())
button_clear=Button(root, text="Clear", padx=30,pady=20, command=lambda: button_click())

# Put the bottons 
button_1.grid(row=3, column=0)
button_2.grid(row=3, column=1)
button_3.grid(row=3, column=2)
button_4.grid(row=2, column=0)
button_5.grid(row=2, column=1)
button_6.grid(row=2, column=2)
button_7.grid(row=1, column=0)
button_8.grid(row=1, column=1)
button_9.grid(row=1, column=2)
button_0.grid(row=4, column=0)
button_click.grid(row=4, column=1)
button_equals.grid(row=6, column=0, columnspan=3)
button_clear.grid(row=4, column=2)

root.mainloop()

Text is not getting entered in entry box.

Asked By: Sam Wittwicky

||

Source

Answer 1

It seems to be because of this line:

button_click=Button(root, text="+", padx=40,pady=20, command=lambda: button_click())

Where you redefine button_click as a Button.

Answered By: Artygo

Answer 2

You have a function button_click whereas you also have a button with the same name. Hence when you are passing a function in the command, the button calls by that name but by that time the button_click is just a Button that isn’t callable.
Rename the function to Click_Button or rename the button in case the function does not have the same name as anything else it will work

Answered By: Ayesha Nadeem

Answer 3

I found a workaround for this problem, however, it makes the code a bit complex if there are greater number of buttons.

There is code for it:

from tkinter import *
from functools import partial
root=Tk()
root.title("Simple Calculator")
e=Entry(root, width=35, borderwidth=5)
e.grid(row=0, column=0, columnspan=3, padx=10, pady=10 )

def button_click(number):
    e.delete(0, END)
    e.insert(0, number)

action_with_arg1 = partial(button_click, 1)
action_with_arg2 = partial(button_click, 2)
action_with_arg3 = partial(button_click, 3)
action_with_arg4 = partial(button_click, 4)
action_with_arg5 = partial(button_click, 5)
action_with_arg6 = partial(button_click, 6)
action_with_arg7 = partial(button_click, 7)
action_with_arg8 = partial(button_click, 8)
action_with_arg9 = partial(button_click, 9)
action_with_arg0 = partial(button_click, 0)
#Define buttons
button_1=Button(root, text="1", padx=40,pady=20, command=action_with_arg1)

button_2=Button(root, text="2", padx=40,pady=20, command=action_with_arg2)
button_3=Button(root, text="3", padx=40,pady=20, command=action_with_arg3)
button_4=Button(root, text="4", padx=40,pady=20, command=action_with_arg4)
button_5=Button(root, text="5", padx=40,pady=20, command=action_with_arg5)
button_6=Button(root, text="6", padx=40,pady=20, command=action_with_arg6)
button_7=Button(root, text="7", padx=40,pady=20, command=action_with_arg7)
button_8=Button(root, text="8", padx=40,pady=20, command=action_with_arg8)
button_9=Button(root, text="9", padx=40,pady=20, command=action_with_arg9)
button_0=Button(root, text="0", padx=40,pady=20, command=action_with_arg0)
button_click=Button(root, text="+", padx=40,pady=20, command=button_click())
button_equals=Button(root, text="=", padx=120,pady=20, command=button_click())
button_clear=Button(root, text="Clear", padx=30,pady=20, command=button_click())

# Put the bottons 
button_1.grid(row=3, column=0)
button_2.grid(row=3, column=1)
button_3.grid(row=3, column=2)
button_4.grid(row=2, column=0)
button_5.grid(row=2, column=1)
button_6.grid(row=2, column=2)
button_7.grid(row=1, column=0)
button_8.grid(row=1, column=1)
button_9.grid(row=1, column=2)
button_0.grid(row=4, column=0)
button_click.grid(row=4, column=1)
button_equals.grid(row=6, column=0, columnspan=3)
button_clear.grid(row=4, column=2)

root.mainloop()

Answered By: Sam Wittwicky

Button object not callable in Tkinter

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