save project

my_tree.py

 import turtle
-
+import random
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
-
 def tree(n):
-    if n >= 50:
+    if n >= 0:
+        if n<=12:
+            a = random.randint(1,2)
+            if a == 1:
+                pen.pencolor('snow')
+            else:
+                pen.pencolor('lightcoral')
+            pen.pensize(n/3)
+        else:
+            pen.pencolor('sienna')
+            pen.pensize(n/10)
+        dushu = random.randint(1,30)
+        changdu = random.randint(1,15)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        pen.right(dushu)
+        tree(n-changdu)
+        pen.left(2*dushu)
+        tree(n-changdu)
+        pen.right(dushu)
         pen.up()
         pen.backward(n)
         pen.down()
@@ -24,6 +35,6 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
-tree(100)
+tree(60)
 
 turtle.done()