3.2

from tkinter import *

def bu(n,s):
    global l1
    global l2
    l1.destroy()
    l2.destroy()
    l1 = Label(u2_frame, text=s,width=30, height=0,font=("Arial", 16))
    l2 = Label(u2_frame, text=n, bg='#fff',width=30, height=0,font=("Arial", 12))
    l1.pack(pady = 10)
    l2.pack(pady = 10, padx = 3)

root = Tk()
u_frame = Frame(root)
u2_frame = Frame(root)
l1 = Label(u2_frame, text="", width=30, height=0, font=("Arial", 16))
l2 = Label(u2_frame, text="", bg='#fff', width=30, height=0,font=("Arial", 12))
b1 = Button(u_frame,  width=5, height=2, bg='#ff0000',command=lambda: bu("#ff0000","красный"))
b2 = Button(u_frame,  width=5, height=2, bg='#ff7d00',command=lambda: bu("#ff7d00","оранжевый"))
b3 = Button(u_frame,  width=5, height=2, bg='#ffff00',command=lambda: bu("#ffff00","желтый"))
b4 = Button(u_frame,  width=5, height=2, bg='#00ff00',command=lambda: bu("#00ff00","зеленый"))
b5 = Button(u_frame,  width=5, height=2, bg='#007dff',command=lambda: bu("#007dff","голубой"))
b6 = Button(u_frame,  width=5, height=2, bg='#0000ff',command=lambda: bu("#0000ff","синий"))
b7 = Button(u_frame,  width=5, height=2, bg='#7d00ff',command=lambda: bu("#7d00ff","фиолетовый"))

u2_frame.pack()
u_frame.pack()
b7.pack(pady = 1, padx = 1, side=RIGHT)
b6.pack(pady = 1, padx = 1, side=RIGHT)
b5.pack(pady = 1, padx = 1, side=RIGHT)
b4.pack(pady = 1, padx = 1, side=RIGHT)
b3.pack(pady = 1, padx = 1, side=RIGHT)
b2.pack(pady = 1, padx = 1, side=RIGHT)
b1.pack(pady = 1, padx = 1, side=RIGHT)
l2.pack(pady = 10, padx = 1, side=BOTTOM)
l1.pack(pady = 10, padx = 1, side=BOTTOM)


root.mainloop()