Simple GUI Calculator Using Tkinter In Python

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We will make a Simple GUI Calculator Using Tkinter In Python which is a python module to make GUI applications simply so that’s why we will use it to make a GUI Calculator Using tkinter

Here we are going to provide you with the source code with a complete explanation so that you can easily make your GUI Calculator Using tkinter

Source Code

# importing the tkinter module
from tkinter import *

# initializing the tkinter
root = Tk()

# setting the width and height of the gui
root.geometry("430x500")    # x is small case here

# declaring an empty string variable
expression = ""

# defining function which will set expressions and answers to the  user
def setexpression(num):
    global expression
    expression = expression + str(num)
    value.set(expression)

# defining a function to calculate the expression entered by the user
def calculator():
    try:
        global expression
        answer = str(eval(expression))
        value.set(answer)
    except:
        value.set("Enter correct expression")
        expression = ""

# function to clear everything in expression
def clear():
    global expression
    expression = ""
    value.set(expression)

# declaring font variables as ("Language", size)
large_font = ('Verdana', 15)
small_font = ('Verdana', 10)

# declaring variable to take value of expression entered by the user
value = StringVar(value="Enter expression")

# entry widget to take expression from user and to show 
# calculations 
Entry(root, textvariable=value, font=large_font).grid(row=0, 
    column=0, columnspan=4, ipadx=70)

# Now, there are some most basic buttons which should be present 
# in a calculator
# here, each button is calling the setexpression function which 
# is used to set values in the entry widget entered by the user 
# on pressing the buttons 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, .
Button(root, text="+", fg="red", command=lambda: 
    setexpression("+"), height=4,width=8).grid(row=1,column=0,pady=10)
Button(root, text="-", fg="red", command=lambda:
    setexpression("-"), height=4, width=8).grid(row=2, column=0, pady=10)
Button(root, text="X", fg="red", command=lambda: 
    setexpression("*"), height=4, width=8).grid(row=3, column=0,pady=10)
Button(root, text="/", fg="red", command=lambda: 
    setexpression("/"), height=4, width=8).grid(row=4, column=0,pady=10)
Button(root, text="1", fg="red", command=lambda: 
    setexpression("1"), height=4, width=8).grid(row=1, column=1,pady=10)
Button(root, text="2", fg="red", command=lambda: 
    setexpression("2"), height=4, width=8).grid(row=1, column=2,pady=10)
Button(root, text="3", fg="red", command=lambda: 
    setexpression("3"), height=4, width=8).grid(row=1, column=3,pady=10)
Button(root, text="4", fg="red", command=lambda: 
    setexpression("4"), height=4, width=8).grid(row=2, column=1,pady=10)
Button(root, text="5", fg="red", command=lambda: 
    setexpression("5"), height=4, width=8).grid(row=2, column=2)
Button(root, text="6", fg="red", command=lambda: 
    setexpression("6"), height=4, width=8).grid(row=2, column=3,pady=10)
Button(root, text="7", fg="red", command=lambda: 
    setexpression("7"), height=4, width=8).grid(row=3, column=1,pady=10)
Button(root, text="8", fg="red", command=lambda: 
    setexpression("8"), height=4, width=8).grid(row=3, column=2,pady=10)
Button(root, text="9", fg="red", command=lambda: 
    setexpression("9"), height=4, width=8).grid(row=3, column=3,pady=10)
Button(root, text="0", fg="red", command=lambda: 
    setexpression("0"), height=4, width=8).grid(row=4, column=2,pady=10)
Button(root, text=".", fg="red", command=lambda: 
    setexpression("."), height=4, width=8).grid(row=4, column=1,pady=10)

# "=" button to call the calculator button which will return and 
# show the calculated value in the entry widget
Button(root, text="=", fg="red", command=calculator, height=4,
width=8).grid(row=4, column=3, pady=10)

# "Clear" button to call the clear function which will clear the 
# entry widget so that the user can start clculating again
Button(root, text="Clear", fg="red", command=clear, height=4, 
    width=20).grid(row=5, column=1, pady=10)

# .mainloop() is used when the code is ready to run
root.mainloop()

Thanks for reading


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3 thoughts on “Simple GUI Calculator Using Tkinter In Python

  1. in your source code in line 52 is an “h” missing in front of eight…
    should be “height”….
    than it works fine, thanks 🙂

  2. Brilliant post this match. I was checking constantly this vortal and Im ecciting! Extremely useful info specifically the last post 🙂 I was looking for this particular info for a long time. Thank you and good luck…

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