save project

my_tree.py

 import turtle
-
-pen.left(90)
-pen.up()
-pen.backward(150)    # 后退
-pen.down()
-def tree(n):
-    if >= 50:
-        pen.forward(n)
-        pen.right(30)
-        tree(n-50)
-        pen.left(60)
-        tree(n-50)
-        pen.right(30)
-        pen.backward(n)
+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
-
-tree(100)
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+def tree(n):
+        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.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)
+    
+tree(65)
 turtle.done()