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
@@ -11,19 +11,27 @@ pen.left(90)
 pen.up()
 pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
-
+color=['snow','lightcoral']
 def tree(n):
 def tree(n):
-    if n>=50:
+    if n>=0:
+        length=random.randint(0,15)
+        if n<=12:
+            pen.color(random.choice(color))
+            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)
+        angle=random.randint(0,30)
+        pen.right(angle)
+        tree(n-length)
+        pen.left(2*angle)
+        tree(n-length)
         pen.up()
         pen.up()
-        pen.right(30)
+        pen.right(angle)
         pen.backward(n)
         pen.backward(n)
         pen.down()
         pen.down()
         
         
-tree(100)
-
+tree(60)
+turtle.done()
   
   
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