GUI CALCULATOR USING TKINTER IN PYTHON
INTRODUCTION:
Calculator is used in
everyday life. From the small calculation to the big calculation, calculator is
used. Designing a calculator can be done in many ways, one way of designing is
by using Python. I have explained all the procedures of designing a calculator
using Python.
BUTTONS:
First we have to create 16
buttons, for creating buttons we are using the command which is given below,
“button1 = Button(abc,
text=' 1 ', fg='black', bg='white', command=lambda: press(1), height=5,
width=10) button1.grid(row=2, column=0)”
Using the word button a
new button is created, ‘fg’ is for front colour and ‘bg’ is for background
colour. ‘Height’ specifies the height of a button and ‘width’ specifies the
width of the button. In grid we given the row and column where the button
should be displayed.
In the same way do it for
16 buttons
FUNCTIONS:
We have to create some
functions to run the program.
“command=lambda: press(1)”
This command is given
inside of the button. This command is used to call a function when several
buttons access the same function, the word ‘lambda’ is used.
Here we are creating three
functions for first 14 buttons we use the same functions and then for next two
buttons we use different functions separately because one button is ’clear’ and
the other button is ‘equal’
We define the function in
the name ‘def’
ie.“def press(num): “This
is how the function is declared and all the basic functions are declared within
it.
In the function
equalpress(), we are using two functions they are ‘try’ and ‘except’. The fun
‘try’ will check the conditions within it, if everything is true then it will
be displayed or else it will go to ‘except’ and the output is displayed as
“there is error”. After we rectify the error or after giving a correct input
the output will be displayed.
SOURCE
CODE:
from tkinter import
*
op = ""
def press(num):
global
op
op
= op + str(num)
equation.set(op)
def equalpress():
try:
global
op
total
= str(eval(op))
equation.set(total)
op
= ""
except:
equation.set("
error ")
op
= ""
def clear():
global
op
op
= ""
equation.set("")
abc = Tk()
abc.configure(background="light
grey")
abc.title("Calculator")
abc.geometry("350x400")
equation = StringVar()
op_field =
Entry(abc,font=("arial",30,"bold"),textvariable=equation)
op_field.grid(columnspan=70,ipadx=70)
equation.set('enter the
operand')
button1 = Button(abc,
text=' 1 ', fg='black', bg='white', command=lambda: press(1), height=5,
width=10)
button1.grid(row=2,
column=0)
button2 = Button(abc,
text=' 2 ', fg='black', bg='white', command=lambda: press(2), height=5,
width=10)
button2.grid(row=2,
column=1)
button3 = Button(abc,
text=' 3 ', fg='black', bg='white', command=lambda: press(3), height=5, width=10)
button3.grid(row=2,
column=2)
button4 = Button(abc,
text=' 4 ', fg='black', bg='white', command=lambda: press(4), height=5,
width=10)
button4.grid(row=3,
column=0)
button5 = Button(abc,
text=' 5 ', fg='black', bg='white', command=lambda: press(5), height=5,
width=10)
button5.grid(row=3,
column=1)
button6 = Button(abc,
text=' 6 ', fg='black', bg='white', command=lambda: press(6), height=5,
width=10)
button6.grid(row=3,
column=2)
button7 = Button(abc,
text=' 7 ', fg='black', bg='white', command=lambda: press(7), height=5,
width=10)
button7.grid(row=4,
column=0)
button8 = Button(abc,
text=' 8 ', fg='black', bg='white', command=lambda: press(8), height=5,
width=10)
button8.grid(row=4,
column=1)
button9 = Button(abc,
text=' 9 ', fg='black', bg='white', command=lambda: press(9), height=5,
width=10)
button9.grid(row=4,
column=2)
button0 = Button(abc,
text=' 0 ', fg='black', bg='white', command=lambda: press(0), height=5,
width=10)
button0.grid(row=5,
column=0)
plus = Button(abc, text='
+ ', fg='black', bg='white', command=lambda: press("+"), height=5,
width=10)
plus.grid(row=2, column=3)
minus = Button(abc, text='
- ', fg='black', bg='white', command=lambda: press("-"), height=5,
width=10)
minus.grid(row=3, column=3)
multiply =
Button(abc, text=' * ', fg='black', bg='white', command=lambda:
press("*"), height=5, width=10)
multiply.grid(row=4,
column=3)
divide = Button(abc,
text=' / ', fg='black', bg='white', command=lambda: press("/"),
height=5, width=10)
divide.grid(row=5,
column=3)
equal = Button(abc, text='
= ', fg='black', bg='white', command=equalpress, height=5, width=10)
equal.grid(row=5, column=2)
clear = Button(abc,
text='Clear', fg='black', bg='white', command=clear, height=5, width=10)
clear.grid(row=5,
column='1')
abc.mainloop()
CONCLUSION:
Hence we could create an
application ,ie. Calculator using GUI in python, in the same way we can create
many applications, all these basic commands and simple logic will be used in
every places.
If you have any doubt
regarding this blog and if you couldn’t understand the program, please watch my
video for clear understanding.
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