Лучшим способом является привязка какого-либо события к кнопке:
from tkinter import *
class Minesweeper:
def __init__(self, action):
L=[]
for i in range(15):
for j in range(15):
self.action = Button(win, text="h")
# bind to button function 'clickMe' that runs while <Button-1> clicked on it
self.action.bind("<Button-1>", self.clickMe)
self.action.grid(column=i, row=j)
def clickMe(self, event):
"""changes the 'fg' color of the events widget"""
event.widget.configure(foreground="red")
def main():
global win
win = Tk()
win.title('Minesweeper')
game = Minesweeper(win)
win.mainloop()
main()