save project

my_tree.py

 import turtle
+import random
+
 
 pen = turtle.Turtle()
 pen.color('sienna')
+pen.speed(0)
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
@@ -12,31 +15,30 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
-#pen.forward(100)
-#pen.right(30)
-#pen.forward(50)
-#pen.forward(-50)
-
-#pen.left(60)
-#pen.forward(50)
-
-#pen.forward(-50)
-#pen.right(30)
-#pen.forward(-100)
 
 
 def tree(n):
-    if n>=50:
-        forward(n)
-        right(30)
-        forward(n-50)
-        left(30)
-        up()
-        backword(n)
-        down()
-        left(60)
-        tree(n-50)
-        right(50)
-   
-tree(100)
+    if n>=0:
+        if n<=12:
+            lest=['black','red']
+            pen.pensize(n/3)
+            color=random.choice(lest)
+            pen.color(color)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+        a=1.5*random.random()    
+        pen.forward(n)
+        b=random.random()
+        pen.right(30*b)
+        tree(n-10*a)
+        pen.left(60*b)
+        tree(n-10*a)
+        pen.right(30*b)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+   
+tree(60)
 turtle.done()