save project

my_tree.py

 import turtle
 import turtle
+import random
 
 
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
@@ -11,16 +12,29 @@ pen.left(90)
 pen.up()
 pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.up()
-pen.backward(50)
-pen.down()
-pen.lrft(60)
-pen.forward(50)
-pen.up()
-pen.backward(50)
-pen.down()
-
+def tree(n):
+    if n >= 0:
+        if n <=12:
+            color_list = ['snow','lightcoral']
+            color = random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+        pen.forward(n)
+        a = random.random()
+        pen.right(30*a)
+        l = 1.5*random.random()
+        tree(n-10*l)
+        pen.left(60*a)
+        tree(n-10*l)
+        pen.right(30*a)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(50)
 turtle.done()
 turtle.done()
+
+
+