from tkinter import *
from tkinter import colorchooser

root = Tk()

colors = ['red', 'orange', 'yellow', 'green', 'cyan', 'blue', 'purple']
for i in range(7):#i = 0, 1, 2, 3, 4, 5, 6
    btn = Button(root, width = 10, bg = colors[i])
    btn.grid(row = 0, column = i)

c = Canvas(root, width = 500, height = 500, bg = 'white')
c.grid(row = 1, column = 0, columnspan = 7)