save project

my_tree.py

 import turtle
 import turtle
-
+import random
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
 # 画布大小
 # 画布大小
@@ -11,18 +11,20 @@ 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 n>=50:
+    if n>=0:
+        pen.pensize(n/6)
         pen.forward(n)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        angle=random.random()
+        l=random.random()
+        pen.right(30*angle)
+        tree(n-10*l)
+        pen.left(60*angle)
+        tree(n-10*l)
+        pen.right(30*angle)
         pen.backward(n)
         pen.backward(n)
-    
-
 
 
-tree(100)
+tree(50)
 
 
 turtle.done()
 turtle.done()