in this lab we used character (+ -) to draw a 4×4 square
def do_twice(f):
f()
f()
def do_four(f):
do_twice(f)
do_twice(f)
def print_beam():
print ‘+ – – – -‘,
def print_post():
print ‘| ‘,
def print_beams():
do_twice(print_beam),
print ‘ + ‘
def print_posts():
do_twice(print_post),
print ‘ | ‘
def print_row():
print_beams(),
do_four(print_posts)
def print_grid():
do_twice(print_row),
print_beams()
print_grid;
print_grid()