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
@@ -11,5 +11,27 @@ pen.left(90)
 pen.up()
 pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
+pen.speed(0)
+def t(n):
+    if n>0:
+        l=random.randint(1,15)
+        a=random.randint(0,30)
+        if n<=15:
+            pen.pensize(n/3)
+            pen.pencolor(random.choice(['snow','lightcoral']))
+        else:
+            pen.pensize(n/10)
+            pen.color('sienna')           
+        pen.forward(n)
+        pen.right(a)
+        t(n-l)
+           # 后退
         
         
+        pen.left(2*a)
+        t(n-l)
+        pen.right(a)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+t(70)  
 turtle.done()
 turtle.done()