save project

my_tree.py

 import turtle
 import random
-
+pen = turtle.Turtle()
+pen.color('sienna')
+# pen.speed(1)
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)
+pen.down()
 
 # 分形树
 def tree(n):
-    if n >= 50:
+    if n >= 0:
+        if n<=12:
+            color_list = ['snow', 'lightcoral']
+            pen.color(color)
+            pen.pensize(n / 3)
+        else:
+            pen.color('sienna')  
+            pen.pensize(n / 10)
+        sb=random.randint(0,30)
+        SB=random.randint(1,15)
+        pen.pensize(n/10)
         pen.forward(n)
-        angle = random.randint(0,30)
-        pen.right(angle)
-        tree(n-10)
-        pen.left(2*angle)
-        tree(n-10*)
-        pen.right(angle)
+        pen.right(sb)
+        tree(n-SB)
+        pen.left(2*sb)
+        tree(n-SB)
+        pen.right(sb)
         pen.up()
         pen.backward(n)
         pen.down()
-        
-turtle.done()
 
+tree(100)
+turtle.done()
 
 
 
 
+if n <= 12:
+            color_list = ['snow', 'lightcoral']
+            color = random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n / 3)
+        else:
+            pen.color('sienna')  # 赭(zhě)色
+            pen.pensize(n / 10)