save project

my_tree.py

 import turtle
 import random
 pen = turtle.Turtle()
-pen.color('red')
+pen.color('sienna')
 pen.speed(0)
 pen.left(90)
 w = turtle.Screen()
-w.bgcolor('black')
+w.bgcolor('wheat')
 pen.pu()      
-pen.backward(150)
+pen.backward(300)
 pen.pd()# wheat小麦
-def tree(n): 
-    if n>50:
-        ag=random.randint(0,120)
-        le=random.randint(1,40)
-        pen.pensize(n/20)
-        pen.fd(ag)
+def tree(n):
+    if n<= 12:
+        pen.pencolor(random.choice(['lightcoral','snow']))
+        pen.pensize(n/1)
+    else:
+        pen.pencolor('sienna')
+        pen.pensize(n/8)
+    if n>0:
+        ag=random.randint(0,20)
+        le=random.randint(1,25)
+        pen.fd(n)
         pen.right(le)
-        tree(n-10)
+        tree(n-ag)
         pen.left(2*le)
-        tree(n-10)
+        tree(n-ag)
         pen.right(le)
-
-        
         pen.pu()
-        pen.backward(ag)
+        pen.backward(n)
         pen.pd()
     
         
-print(tree(100))
+tree(80)
         
     # 移动到起点
     #pen.left(90)