save project

my_tree.py

@@ -3,19 +3,29 @@ import random
 
 def tree(n):
     if n>= 0:
+        if n <= 12:
+            color_list = ['snow','lightcoral']
+            color = random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        angle = random.randint(0,30)
+        length = 1.5*random.random()
+        pen.right(angle)
+        tree(n-10*length)
+        pen.left(2*angle)
+        tree(n-10*length)
+        pen.right(angle)
         pen.up()
         pen.backward(n)
         pen.down()
 
 
 pen = turtle.Turtle()
-pen.color('sienna')
+
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
@@ -26,5 +36,5 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
-tree(50)
+tree(70)
 turtle.done()