Chapter -15 (Graphical interface of Python)

Example-1:

Code:

from tkinter import *

def Calculate():

    temp=int(entry.get())

    temp=9/5*temp+32

    output_label.configure(text='Converted: {:.1f}'.format(temp))

    entry.delete(0,END)

root=Tk()

message_label=Label(text='Enter a temperature',font=('Verdana',16))

output_label=Label(font=('Verdana',16))

entry=Entry(font=('Verdana',16), width=4)

cal_button=Button(text='Ok' , font=('Verdana',16), command=Calculate)

message_label.grid(row=0, column=0)

entry.grid(row=0, column=1)

output_label.grid(row=1 , column=0 , columnspan=3)

cal_button.grid(row=0 , column=2)

mainloop()

Result:

Explanation:-

Example-2:-

Code:

from tkinter import *

alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

def callback(x):

    label.configure(text='Button {} clicked'.format(alphabet[x]))

    

root = Tk()

label=Label()

label.grid(row=1, column=0 , columnspan=26)

buttons = [0]*26

for i in range(26):

    buttons = Button(text=alphabet[i] , command=lambda x=i: callback(x))

    buttons.grid(row=0, column=i)

    

mainloop()

Result:

Explanation:-

Example-3:

Code:

from tkinter import *

def click():

    label.configure(text='Button clicked')

root=Tk()

button=Button(text='Click me', command=click)

label=Label(text='Button clicked')

label.grid(row=0 , column=0)

button.grid(row=1, column=0)

mainloop()

Result:

Explanation:-

Example-4: 

Code:

Result:

Explanation:-