Python | Add style to tkinter button

Tkinter is a Python standard library that is used to create GUI (Graphical User Interface) applications. It is one of the most commonly used packages of Python. Tkinter supports both traditional and modern graphics support with the help of Tk themed widgets. All the widgets that Tkinter also has available in tkinter.ttk.
Adding style in a tkinter.ttk button is a little creepy because it doesn’t support direct implementation. To add styling in a ttk.Button we have to first create an object of style class which is available in tkinter.ttk.

We can create ttk.Button by using the following steps:

btn = ttk.Button(master, option = value, ...)

ttk.Button options –

command: A function to be called when button is pressed. 
text: Text which appears on the Button. 
image: Image to be appeared on the Button. 
style: Style to be used in rendering this button.

To add styling on the ttk.Button we cannot directly pass the value in the options. Firstly, we have to create a Style object which can be created as follows: 

 style = ttk.Style()

Below code will be adding style to only selected Buttons i.e, only those buttons will get changed in which we will be passing style option.
Code #1: 

Python3

# Import Required Module
from tkinter import *
from tkinter.ttk import *

# Create Object
root = Tk()

# Set geometry (widthxheight)
root.geometry('100x100')

# This will create style object
style = Style()

# This will be adding style, and
# naming that style variable as
# W.Tbutton (TButton is used for ttk.Button).
style.configure('W.TButton', font =
               ('calibri', 10, 'bold', 'underline'),
                foreground = 'red')

# Style will be reflected only on
# this button because we are providing
# style only on this Button.
''' Button 1'''
btn1 = Button(root, text = 'Quit !',
                style = 'W.TButton',
             command = root.destroy)
btn1.grid(row = 0, column = 3, padx = 100)

''' Button 2'''

btn2 = Button(root, text = 'Click me !', command = None)
btn2.grid(row = 1, column = 3, pady = 10, padx = 100)

# Execute Tkinter
root.mainloop()

Output:

Only one button will get styled because in the above code we are providing styling only in one Button.

Code #2 Apply style on all the available buttons 

Python3

# Import Required Module
from tkinter import *
from tkinter.ttk import *

# Create Root Object
root = Tk()

# Set Geometry(widthxheight)
root.geometry('100x100')

# Create style Object
style = Style()


# Will add style to every available button
# even though we are not passing style
# to every button widget.
style.configure('TButton', font =
               ('calibri', 10, 'bold', 'underline'),
                foreground = 'red')
# button 1
btn1 = Button(root, text = 'Quit !',
                  style = 'TButton',
             command = root.destroy)

btn1.grid(row = 0, column = 3, padx = 100)

# button 2
btn2 = Button(root, text = 'Click me !', command = None)
btn2.grid(row = 1, column = 3, pady = 10, padx = 100)

# Execute Tkinter
root.mainloop()

Output:

Now if you want to change the appearance of the buttons by the movement of the mouse i.e, now when we hover the mouse over the button it will change its color when we press it will change color, and so on. 

Code #3 Change color on mouse hover 

Python3

# Import Required Module
from tkinter import *
from tkinter.ttk import *

# Create Root Object
root = Tk()
# Set Geometry(widthxheight)
root.geometry('500x500')

# Create style Object
style = Style()

style.configure('TButton', font =
               ('calibri', 20, 'bold'),
                    borderwidth = '4')

# Changes will be reflected
# by the movement of mouse.
style.map('TButton', foreground = [('active', '!disabled', 'green')],
                     background = [('active', 'black')])

# button 1
btn1 = Button(root, text = 'Quit !', command = root.destroy)
btn1.grid(row = 0, column = 3, padx = 100)

# button 2
btn2 = Button(root, text = 'Click me !', command = None)
btn2.grid(row = 1, column = 3, pady = 10, padx = 100)

# Execute Tkinter
root.mainloop()

Output: