# Tk_simple_button_animation.py

# Tk_simple_button_animation.py

from tkinter import *

root = Tk()
root.title('Simple Button Animation')
root.geometry("400x300")

#define some variables
count = 0
size = 26
pos = 100

# Contract the button
def contract():
    global count, size, pos
    if count:
        size -= 2
        # Configure button font size
        my_button.config(font=("Helvetica", size))
        # Change button position
        my_button.pack_configure(pady=pos)
        # decrease the count by 1
        count -= 1
        pos += 2
        # Set a timer
        root.after(4, contract)

# Expand the button
def expand():
    global count, size, pos
    if count < 15:
        size += 2
        # Configure button font size
        my_button.config(font=("Helvetica", size))
        # Change button position
        my_button.pack_configure(pady=pos)
        # Increase the count by 1
        count += 1
        pos -= 2
        # Set the timer
        root.after(2, expand)

    else:
        contract()


# Create a button
my_button = Button(root,
    text="Click Me!",
    command=expand,
    font=("Helvetica", 24),
    fg="red")
my_button.pack(pady=100)


root.mainloop()