Python tKinter 4

Adding a button widget

The button can be created using the Button class. The Button class constructor requires a reference to the main window and to the options.

Syntax:
Button(window, attributes)

You can set the following important properties to customize a button:

text : caption of the button
bg : background colour
fg : foreground colour
font : font name and size
image : to be displayed instead of text
command : function to be called when clicked

 

from tkinter import *
window=Tk()
btn=Button(window, text="This is Button widget", fg='blue')
btn.place(x=80, y=100)
window.title('Hello Python')
window.geometry("300x200+10+10")
window.mainloop()

Output:

Multiple Buttons with different

text color,
background colors,
different locations,
Fonts

 

from tkinter import *
window=Tk()
btn1=Button(window, text="Button one", fg='blue',bg='red',font=("Arial Bold", 15))
btn2=Button(window, text="Button two", fg='blue',bg='green',font=("Arial Bold", 15))
btn3=Button(window, text="Button three", fg='white',bg='blue',font=("Arial Bold", 15))
btn4=Button(window, text="Button four", fg='blue',bg='pink', font=("Arial Bold", 15))
btn1.place(x=10, y=100)
btn2.place(x=180, y=100)
btn3.place(x=10, y=300)
btn4.place(x=180, y=300)

window.title('Hello Python')
window.geometry("500x400+10+10")
window.mainloop()

Output:

Handle button click event

We want to display a message in lable as a button is clicked.

First, we will write the function that we need to execute when the button is clicked:

def clicked():
            lbl.configure(text=”Button was clicked !!”)

Then we will wire it with the button by specifying the function like this:

btn = Button(window, text=”Click Me”, command=clicked)

Note that, we typed clicked only not clicked() with parentheses.
Now the full code will be like this:

 

from tkinter import *
window = Tk()
window.title("Welcome to Button Event Handling")
window.geometry('350x300')
window.configure(bg='blue')
lbl = Label(window, text="Hello",font=("Arial Bold", 20))
#lbl.grid(column=0, row=0)
lbl.place(x=10,y=40)
def clicked():
    lbl.configure(text="Button was clicked !!")

btn = Button(window, text="Click Me", command=clicked)
#btn.grid(column=1, row=0)
btn.place(x=10,y=200)

window.mainloop()

Output:

On clicking Button

 

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