save project

my_tree.py

@@ -7,16 +7,26 @@ w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 w.bgcolor('wheat')      # wheat小麦
 def tree(n):
 def tree(n):
     if n>=0:
     if n>=0:
+        if n<=12:
+            colour_list=['snow','lightcoral']
+            colour=random.choice(colour_list)
+            pen.color(colour)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
         pen.forward(n)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        angle=random.random()
+        pen.right(30*angle)
+        lenght=1.5*random.random()
+        tree(n-10*lenght)
+        pen.left(60*angle)
+        tree(n-10*lenght)
+        pen.right(30*angle)
         pen.up()
         pen.up()
         pen.backward(n)    # 后退
         pen.backward(n)    # 后退
         pen.down()
         pen.down()
-        pen.speed(50)
+        pen.speed(100)
     # 移动到起点
     # 移动到起点
 pen.left(90)
 pen.left(90)
 pen.up()
 pen.up()