save project

my_tree.py

 import turtle
 import turtle
+import random
+
 
 
 def tree(n):
 def tree(n):
-    if n>=50:
+    if n>=0:
+        pen.pensize(n/10)
+        if n<=12:
+            pen.pencolor("lightcoral")
+            pen.pensize()
+        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)
+        a=random.randint(0,30)
+        b=random.randint(0,15)
+        pen.right(a)
+        tree(n-b)
+        pen.left(2*a)
+        tree(n-b)
+        pen.right(a)
         pen.up()
         pen.up()
         pen.backward(n)
         pen.backward(n)
         pen.down()
         pen.down()
 
 
 pen=turtle.Turtle()
 pen=turtle.Turtle()
 pen.speed(0)
 pen.speed(0)
+
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
 # 画布大小
 # 画布大小
@@ -25,7 +37,7 @@ pen.left(90)
 pen.up()
 pen.up()
 pen.forward(-150)    # 后退
 pen.forward(-150)    # 后退
 pen.down()
 pen.down()
-tree(100)
+tree(60)