save project

my_tree.py

 import turtle
+import random
 
 pen = turtle.Turtle()
 pen.color('sienna')
@@ -12,6 +13,41 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
+def tree(n):
+    if n>=0:
+        if n>=12:
+            coior_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)
+            angle=random.random()
+            pen.right(30*angle)
+            length=1.5*random.random()
+            tree(n-10*length)
+            pen.left(60*angle)
+            tree(n-10*length)
+            pen.right(30*angle)
+            pen.up()
+            pen.backward()
+            pen.down()
+
+
+
+
+
+
+
+
+
+
+
+
+
+
 pen.forward(100)
 pen.left(30)
 pen.forward(50)
@@ -26,4 +62,6 @@ pen.left(30)
 pen.backward(100)
 pen.down()
 
+
+tree(60)
 turtle.done()
\ No newline at end of file