python画出一个梅花

importturtleimportmathdefp_line(t, n, lenght, angle):for i inrange(n):

t.fd(lenght)

t.lt(angle)defpolygon(t, n, length):

angle= 360 /n

p_line(t, n, length, angle)defarc(t, r, angle):

arc_lenght= 2 * math.pi * r * abs(angle) / 360n= int(arc_lenght / 4) + 1step_length= arc_lenght /n

step_angle= float(angle) /n

t.lt(step_angle/ 2)

p.line(t, n, step_angle,step_length)

t.rt(step_angle/ 2)defpetal(t, n, angle):for i in range(2):

arc(t, r, angle)

t.lt(180 -angle)defflower(t, n, r, angle, p):for i inrange(n):

petal(t, n, angle)

t.lt(p/n)defleaf(t, r, angle, p):

t.bengin_fill()

t.down()

flower(t,1, r, angle, p)

t.end_fill()defmain():

window=turtle.Screen()

window.bgcolor('white')

window.title('Draw a flower')

lucy=turtle.Turtle()

lucy.shape('turtle')

lucy.