Question

NEED TO REWRITE THIS IN OOP MODE

######## HOMEWORK 19
###### Rewrite the code in the OOP mode (class mode).

########################### lambda trick

##### first: changing label properties: after you've created a label, you
##### may want to change something about it. To do that, use configure method:

## label.configure(text = 'Yes')
## label.configure(bg = 'white', fg = 'black')

### that change the properties of a label called label.
###################################################
##
from tkinter import *
abc = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

def callback(x):
label.configure(text = 'Button {} clicked'. format(abc[x]))

root = Tk()

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

buttons = [0]*26 ##create a list to hold 26 buttons
for i in range(26):
buttons[i] = Button(text = abc[i],
command = lambda x = i: callback(x))
buttons[i].grid(row = 0, column = i)

mainloop()

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

Note: Please maintain proper code spacing (indentation), just copy the code part and paste it in your compiler/IDE directly, no modifications required.

#code

from tkinter import *

''' class to represent the required GUI '''
class GUI:
    #constructor
    def __init__(self):
        #declaring all instance variables
        self.__root=Tk()
        self.__label=Label()
        #adding created label to the root window
        self.__label.grid(row=1, column=0, columnspan=26)
        self.__buttons=[]
        #setting up buttons
        self.__setup_buttons()

    #method to set up the buttons
    def __setup_buttons(self):
        #creating a list to store all alphabets
        letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
        #looping through each index
        for i in range(len(letters)):
            #creating button with text=current letter, adding command to call self.__callback method
            btn=Button(self.__root,text=letters[i],command = lambda x=i: self.__callback(x))
            #adding button to GUI
            btn.grid(row = 0, column = i)
            #adding button to list
            self.__buttons.append(btn)

    #event handler method
    def __callback(self,x):
        #getting text from button at x index and displaying on the label
        self.__label.configure(text='Button {} clicked'.format(self.__buttons[x]['text']))

    #method to make the window visible
    def set_visible(self):
        self.__root.mainloop()


#main module
if __name__ == '__main__':
    # creating a GUI and making window visible
    gui = GUI()
    gui.set_visible()

#output