save project

my_tree.py

 import turtle
 import turtle
-
+import random
+pen = turtle.Turtle()
+pen.color('sienna')
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+# 移动到起点
 pen.left(90)
 pen.left(90)
 pen.up()
 pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
 def tree(n):
 def tree(n):
-    if >= 50:
+        if n >= 0:
+            pen.pensize(n/10)
+            angle = random.randint(0,30)
+            length = random.randint(1,15)
+            if n-length <= 10:
+                pen.color("snow" or "lightcoral")
+                pen.pensize(n/3)
+            else:
+                pen.color('sienna')
+                pen.pensize(n/10)
             pen.forward(n)
             pen.forward(n)
-        pen.right(30)
-        tree(n-50)
-        pen.left(60)
-        tree(n-50)
-        pen.right(30)
+            pen.right(angle)
+            pen.down()
+            tree(n-length)
+            pen.up()
+            pen.left(2*angle)
+            pen.down()
+            tree(n-length)
+            pen.up()
+            pen.right(angle)
             pen.backward(n)
             pen.backward(n)
-pen = turtle.Turtle()
-pen.color('sienna')
-# 画布大小
-w = turtle.Screen()
-w.bgcolor('wheat')      # wheat小麦
-
-# 移动到起点
     
     
-tree(100)
+tree(65)
 turtle.done()
 turtle.done()