Finish Building A Simple Calculator App - Python Tkinter GUI Tutorial #7

from tkinter import *

root = Tk()
root.title("Simple Calculator")

e = Entry(root, width=35, borderwidth=5)
e.grid(row=0, column=0, columnspan=4, padx=10, pady=10)

def number_button_command(e, text):
current = e.get()
if text == 'c':
e.delete(0, END)
elif text == '=':
try:
result = eval(current)
e.delete(0, END)
e.insert(0, str(result))
except Exception as e:
e.delete(0, END)
e.insert(0, "Error")
else:
e.insert(END, text)

row = 1
col = 0

Button_Texts = ['7', '8', '9', '/', '4', '5', '6', '*', '3', '2', '1', '-', 'c', '0', '=', '+']

for text in Button_Texts:
btn = Button(root, text=f"{text}", padx=40, pady=20, command=lambda text=text: number_button_command(e, text))
btn.grid(row=row, column=col, sticky='nsew', padx=1, pady=1)
if col == 3:
row += 1
col = 0
else:
col += 1

root.mainloop()

Thank you

While running the code , The columns are showing gap in between eachother

it says i need to define "math"

It says math is not defined for me

nice explaination

Is there any way to input decimal digits in this calculator?

Gracias profe, excelente trabajo.

one thing i noticed is you keep repeating code
like cant we inherit and use functions such as eval() instead the if statement

coooooooooooooooooool

Codemy prices have gone up substantially since this recording. The $27 mentioned (with discount) only covers ONE course ($29 actually), not ALL the courses as stated in the video. I am not saying the new price is not worth it, but it's an investment for me I don't want to pay that for just a single course either.

im chain whatching this tutorial. Its amazing. Thank you for your help

Thanks a lot!

Do we have any GitHub repo link to see the code ?

Where can have this source code ??

How do i add comma's in the input like a extra button ',' and make it work?

great tutorials...but for this one i have a question..cant we define global variable math once and use it thorughout in various functions?

Like button smashed and subscribed. - What a great tutorial!

nice..

Now that's what I call a quality work! Thank you so much, John, I am very new to your channel, but I am enjoying it so much! Already learnt a lot of stuff about GUI through your videos, and I have just started! Keep up the good job, sir!

P.S. I was also wondering if there is a way to store a previous operation in a memory by means of consecutive "+" button clicking or smth similar (without clicking "=")? Say for example, I type 2, then +, then 3, then again +, then 4: so that I could get 9 instead of 7.
I am not that good with algorythms, however I am learning. Thank you in advance, John!

And how can we do when we divide a number by zero?

Hey man. Been trying to create an Ans button like on Casio scientific calculators where any time you press '=', you store the value in an Answer variable that can be recalled by the button. How would I port it over to another function?

Thank You So Much!!!

I finally made it but i want to know how to color buttons when we click on them and when they are not clicked also how to color the text please make a video if you haven't or please share the link of video if you've made because its very difficult to find a video from a group of 202 videos.

Thank you

💚💚

awesome!

stupendous!!

Thank you so much!

How can I include cancel button

മച്ചാൻ പൊളി 😍

def b_add():
fst_num = e.get()
global f_num
f_num = int(fst_num)
e.delete(0, END)
def b_equal():
scd_num = e.get()
e.delete(0, END)
e.insert(0, f_num + int(scd_num))

in here the code shows f_num is not defined in the line: e.insert(0, f_num + int(scd_num))
please help sir...🙏

just made a calculator thanks sir !!

My version of calculator:

from tkinter import *

main = Tk()
main.title("Calculator")
textbox = Entry(main, font=("Arial", 20), width=20)
textbox.grid(row=0, column=0, columnspan=5)
space = Label(main, text=" ").grid(row=1, column=1, columnspan=5)


def clearing():
textbox.delete(0, END)

def click(number):
textbox.insert(END, str(number))


def adding():
first_number = textbox.get()
global f_num,status
status="+"
f_num=float(first_number)
textbox.delete(0,END)

def multiplying():
first_number = textbox.get()
global f_num,status
status = "*"
f_num=float(first_number)
textbox.delete(0,END)

def subtracting():
first_number = textbox.get()
global f_num,status
status = "-"
f_num=float(first_number)
textbox.delete(0,END)

def dividing():
first_number = textbox.get()
global f_num,status
status = "/"
f_num=float(first_number)
textbox.delete(0,END)

def equal():
second_number=textbox.get()
textbox.delete(0, END)
if status=="+":
textbox.insert(0,float(f_num)+float(second_number))

elif status == "-":
textbox.insert(0, float(f_num) - float(second_number))

elif status == "*":
textbox.insert(0, float(f_num) * float(second_number))

elif status == "/":
textbox.insert(0, float(f_num) / float(second_number))

button_7 = Button(main, text=7, padx=20, pady=20, bg="White", command=lambda: click(7)).grid(row=2, column=0)
button_8 = Button(main, text=8, padx=20, pady=20, bg="White", command=lambda: click(8)).grid(row=2, column=1)
button_9 = Button(main, text=9, padx=20, pady=20, bg="White", command=lambda: click(9)).grid(row=2, column=2)
button_4 = Button(main, text=4, padx=20, pady=20, bg="White", command=lambda: click(4)).grid(row=3, column=0)
button_5 = Button(main, text=5, padx=20, pady=20, bg="White", command=lambda: click(5)).grid(row=3, column=1)
button_6 = Button(main, text=6, padx=20, pady=20, bg="White", command=lambda: click(6)).grid(row=3, column=2)
button_1 = Button(main, text=1, padx=20, pady=20, bg="White", command=lambda: click(1)).grid(row=4, column=0)
button_2 = Button(main, text=2, padx=20, pady=20, bg="White", command=lambda: click(2)).grid(row=4, column=1)
button_3 = Button(main, text=3, padx=20, pady=20, bg="White", command=lambda: click(3)).grid(row=4, column=2)
button_0 = Button(main, text=0, padx=20, pady=20, bg="White", command=lambda: click(0)).grid(row=5, column=1)
button_dot = Button(main, text=".", padx=20, pady=20, bg="White", command=lambda: click(".")).grid(row=5, column=2)
button_clear = Button(main, text="Clear", padx=40, pady=20, bg="White", command=clearing).grid(row=2, column=3,columnspan=2)
button_plus = Button(main, text="+", padx=20, pady=40, bg="White", command=adding).grid(row=3, column=4,rowspan=2)
button_minus = Button(main, text="-", padx=20, pady=20, bg="White", command=subtracting).grid(row=3, column=3)
button_multiply = Button(main, text="*", padx=20, pady=20, bg="White", command=multiplying).grid(row=4, column=3)
button_divide = Button(main, text="/", padx=20, pady=20, bg="White", command=dividing).grid(row=5, column=3)
button_equalto = Button(main, text="=", padx=20, pady=20, bg="White", command=equal).grid(row=5, column=4)

main.mainloop()

How can I make the calculator in a way where after you click equals, the first thing you type in AFTER that removes the answer to the previous problem, instead of always having to click clear afterwards?

Thank you for providing such videos for 'free'.
Loved how you taught us to build the fully functional calculator!
But there is are some problems that you might face while using the calculator.
You can't perform calculations on floats.
And if you divide something by zero it will give you an error.
This is how you can solve both of these problems-

1. Just change int into float.
2. You can put the divide function into a try block and perform exception handing on it.

Hope this helped you

Awesome tutorial!! Thank you for being so helpful. I finally got it all hatched out.

Thanksss😍♥

Beautifully explained. Learning and enjoying alot! Thanks!

Totally binge watching these right now. Please don't tell everyone how much of a nerd I am...

Thanks man

Can we add Circle buttons instead of Square ?

Getting confused, how did the calculator know that it needs to multiply or divide? The global variable math is only been given a string which "substract" etc...

you are the best teacher in the world

simply AWESOME:)

Thank you for your video... I literally have a school project I need to submit tomorrow and your video has helped a lot. Thanks💚

I also smashed the like button :)

sir you are awesome your tutorials are sooo good.

thanks man, that was great but there is only one problem, when I for example add 2 + 3 it equals 5 and that's nice, but when the process is done and i kept pressing the equal button it will keep adding numbers by itself. will be grateful if you told me why is that and how to fix it