save project

my_tree.py

 import turtle
+import random
 def tree(n):
-    if n>=50:
+    if n>=0:
+        if n<=12:
+            pen.color("lightcoral")
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+        pen.pensize(n/10)
         pen.forward(n)
-        pen.right(30)
-        tree(n-50)
-        pen.left(60)
-        tree(n-50)
-        pen.right(30)
+        a=random.randint(0,30)
+        b=random.randint(0,15)
+        pen.right(a)
+        tree(n-b)
+        pen.left(a*2)
+        tree(n-b)
+        pen.right(a)
         pen.penup()
         pen.forward(-n)
         pen.pendown()
         pen.down()
+
 pen = turtle.Turtle()
+pen.speed(0)
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
@@ -22,7 +33,7 @@ pen.left(90)
 pen.penup()
 pen.forward(-150)    # 后退
 pen.pendown()
-tree(100)
+tree(60)
 
 # pen.forward(100)
 # pen.right(30)