save project

my_tree.py

 import turtle
-
+import random
+color = ["snow","light coral"]
 def tree(n):
-    if n>=50:
+    if n>=0:
+        if n<20:
+            pen.color(random.choice(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=random.randint(1,15)
+        pen.right(angle)
+        tree(n-length)
+        pen.left(2*angle)
+        tree(n-length)
+        pen.right(angle)
         pen.up()
-        pen.backward(n)
-        pen.down()
-
+        pen.forward(-n)
+        pen.pendown()
 
 
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
+pen.speed(1000)
 w.bgcolor('wheat')      # wheat小麦
 # 移动到起点
 pen.left(90)