Tkinter - Button

https://realpython.com/python-gui-tkinter/

INTRODUCTION

'Button' widgets are used to display 'clickable buttons'. They can be configured to call a function whenever they’re clicked.

Many keyword arguments from the 'Label' widget will work for the 'Button' widget.

# button1.py
import tkinter as tk   # Py3

root = tk.Tk()

def callback():
    print("called the callback!")

#button = tk.Button(root, text="Click", command=callback)

button = tk.Button(root,
    text="Click",
    width=25,
    height=5,
    bg="blue",   # the color is changing with the presence of a pointer
    fg="yellow",
    command=callback,
)
button.grid()

root.mainloop()   # run the tkinter event loop

Selected keyword arguments in Button()

master=root     # the first argument
text="Click"
textvariable=strvar   # a variable linked to the button
image=logo
fg="white"   # set the text color to white ('fg' or 'foreground')
bg="black"   # set the background color to black ('bg' or 'background')
width=50   # in text units
height=10   # in text units
font="Times 10 bold"
command=callback   # an action to call when the widget's event occurs
command=sys.exit   # it shuts down the calling program
command=lambda: print("message in the command line")
command=root.quit   # it ends the current mainloop event loop call
command=top.destroy   # it kills the current top-level window

# button2.py
import tkinter as tk

root = tk.Tk()

label = tk.Label(root, text="Press any button")
button1 = tk.Button(root, text="Hello", command=lambda: print("Hello!"))
button2 = tk.Button(root, text="Quit", command=root.quit)

label.grid(row=0, column=0, columnspan=2)
button1.grid(row=1, column=0)
button2.grid(row=1, column=1)

root.mainloop()   # run the tkinter event loop