save project

my_tree.py

 import turtle
 import turtle
+import random
+
 
 
 pen = turtle.Turtle()
 pen = turtle.Turtle()
+pen.speed(0)
 pen.color('sienna')
 pen.color('sienna')
 # 画布大小
 # 画布大小
 w = turtle.Screen()
 w = turtle.Screen()
@@ -13,16 +16,26 @@ pen.backward(150)    # 后退
 pen.down()
 pen.down()
 
 
 def tree(n):
 def tree(n):
-    if n>=10:
+    if n>=0:
+        if n<=12:
+            color=['snow','lightcoral']
+            color=random.choice(color)
+            pen.color(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)
-        pen.right(30)
+        x=random.random()
+        pen.right(30*x)
+        c=1.5*random.random()
+        tree(n-10*c)
+        pen.left(60*x)
+        tree(n-10*c)
+        pen.right(30*x)
         pen.up()
         pen.up()
         pen.backward(n)
         pen.backward(n)
         pen.down()
         pen.down()
         
         
-tree(100)
+tree(60)
 turtle.done()
 turtle.done()