花朵

import turtle  
import math  
  
def p_line(t, n, length, angle):  
    """Draws n line segments."""  
    for i in range(n):  
        t.fd(length)  
        t.lt(angle)  
   
def polygon(t, n, length):  
    """Draws a polygon with n sides."""  
    angle = 360/n  
    p_line(t, n, length, angle)  
   
def arc(t, r, angle):  
    """Draws an arc with the given radius and angle."""  
    arc_length = 2 * math.pi * r * abs(angle) / 360  
    n = int(arc_length / 4) + 1  
    step_length = arc_length / n  
    step_angle = float(angle) / n  
   
    # Before starting reduces, making a slight left turn.  
    t.lt(step_angle/2)  
    p_line(t, n, step_length, step_angle)  
    t.rt(step_angle/2)  
  
def petal(t, r, angle):  
    """Draws a 花瓣 using two arcs."""  
    for i in range(2):  
        arc(t, r, angle)  
        t.lt(180-angle)  
  
def flower(t, n, r, angle, p):  
    """Draws a flower with n petals."""  
    for i in range(n):  
        petal(t, r, angle)  
        t.lt(p/n)  
  
def leaf(t, r, angle, p):  
    """Draws a 叶子 and fill it."""  
    t.begin_fill() # Begin the fill process.  
    t.down()  
    flower(t, 1, r, angle, p)  
    t.end_fill()  
  
def main():  
   
    window= turtle.Screen() #creat a screen  
    window.bgcolor("white")  
    window.title("draw a flower")  
    lucy= turtle.Turtle()  
    lucy.shape("turtle")  
    lucy.color("red")  
    lucy.width(3)  
    #lucy.speed(10)  
   
# Drawing flower  
    flower(lucy, 7, 60, 100, 360)  
   
# Drawing pedicel  
    lucy.color("brown")  
    lucy.rt(90)  
    lucy.fd(200)  
   
# Drawing leaf 1  
    lucy.width(1)  
    lucy.rt(270)  
    lucy.color("green")  
    leaf(lucy, 40, 80, 180)  
    lucy.rt(140)  
    lucy.color("black")  
    lucy.fd(30)  
    lucy.lt(180)  
    lucy.fd(30)  
  
# Drawing leaf 2  
    lucy.rt(120)  
    lucy.color("green")  
    leaf(lucy, 40, 80, 180)  
    lucy.color("black")  
    lucy.rt(140)  
    lucy.fd(30)  
    lucy.ht() # hideturtle  
    window.exitonclick()  
   
main()