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
-w = turtle.Screen()
-w.bgcolor('wheat')      # wheat小麦
 
 
-# 移动到起点
+w= turtle.Screen()
+w.bgcolor('wheat')
+
 pen.left(90)
 pen.left(90)
 pen.up()
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(150)
 pen.down()
 pen.down()
 
 
+def tree(n): 
+    if n >= 12:
+        color_list=['snow','lightcoral']
+        color = random.choice(colo_list) 
+        pen.pensize(n/3)
+    else:
+        pen.color('sienna')
+        pen.pensize(n / 10)
+    pen.forward(n) 
+    angle = random.random()
+    pen.right(30*angle)
+    length = 1.5*random.random()
+    tree(n-10*length)
+    pen.left(60*angle)
+    tree(n-10*length)
+    pen.right((30*angle))
+    pen.up()
+    pen.backward(n)  
+    pen.down()
+
+
+tree(60)
 turtle.done()
 turtle.done()