save project

my_tree.py

 import turtle
 import turtle
+import random
+def tree(n):
+    if n>=0:
+        if n <=12:
+            color_list = ['snow', 'lightcoral']
+            color = random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+        
+        
+        pen.forward(n)
+        angle = random.randint(1,30)
+        length = random.randint(1,15)
+
+        pen.right(angle)
+        tree(n-length)
+
+        pen.left(2*angle)
+        tree(n-length)
+        pen.right(angle)
+        pen.penup()
+        pen.backward(n)
+        pen.pendown()
+
+
+
+
+
+
+
+
 
 
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
@@ -6,10 +40,37 @@ pen.color('sienna')
 w = turtle.Screen()
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 w.bgcolor('wheat')      # wheat小麦
 
 
+
+
+
+
+
+
 # 移动到起点
 # 移动到起点
+'''
 pen.left(90)
 pen.left(90)
 pen.up()
 pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
 
 
+pen.forward(100)
+
+pen.right(30)
+pen.forward(50)
+pen.penup()
+pen.backward(50)
+pen.pendown()
+
+pen.left(60)
+pen.forward(50)
+pen.penup()
+pen.backward(50)
+pen.pendown()
+'''
+pen.left(90)
+pen.penup()
+pen.backward(100)
+pen.pendown()
+tree(60)
+
 turtle.done()
 turtle.done()