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
 w = turtle.Screen()
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 w.bgcolor('wheat')      # wheat小麦
-
+turtle.tracer(False)
 # 移动到起点
 # 移动到起点
 pen.left(90)
 pen.left(90)
 pen.up()
 pen.up()
@@ -13,13 +13,17 @@ pen.backward(150)    # 后退
 pen.down()
 pen.down()
 def s(n):
 def s(n):
     if n>=0:
     if n>=0:
-        if n<=12
+        if n<=12:
             color_list=['snow','lightcoral']
             color_list=['snow','lightcoral']
-            
-        pen.pensize(n/10)
+            color = random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
         pen.forward(n)
         pen.forward(n)
-        angle=random.random(0,30)
-        leng=random.random(1,15)
+        angle=random.randint(0,30)
+        leng=random.randint(1,15)
         pen.right(angle)
         pen.right(angle)
         s(n-leng)
         s(n-leng)
         pen.left(2*angle)
         pen.left(2*angle)