from time import sleep def disp_sym(num, sym):         print(sym*num, end='') #recusion def hanoi(a, b, c, n, tray_num):  if n == 1:   move_tray(a, c)   disp(tray_num)   sleep(0.7)  else:   hanoi(a, c, b, n-1, tray_num)   move_tray(a, c)   disp(tray_num)   sleep(0.7)   hanoi(b, a, c, n-1, tray_num) def move_tray(a, b):  for i in a:   if i != 0:    for j in b:     if j != 0:      b[b.index(j) - 1] = i      a[a.index(i)] = 0      return    b.append(i)    b.pop(0)    a[a.index(i)] = 0    return def disp(tray_num):  global a, b, c  for i in range(tray_num):   for j in ['a', 'b', 'c']:    disp_sym(5, ' ')    eval('disp_sym(tray_num - ' + j + "[i], ' ')")    eval('disp_sym(' + j + "[i], '=')")    disp_sym(1, '|')    eval('disp_sym(' + j + "[i], '=')")    eval('disp_sym(tray_num - ' + j + "[i], ' ')")   print()  print('---------------------------------------------------------------------------') tray_num=int(input("Please input the number of trays:")) tray=[] for i in range(tray_num):  tray.append(i + 1) a=[0]*tray_num b=a[:] c=a[:] a = tray[:] disp(tray_num) hanoi(a, b, c, tray_num, tray_num)