save project

my_tree.py

+import turtle
+import random
+pen = turtle.Turtle()
+pen.speed(0)
+pen.color('sienna')
+# 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)    # 后退
+pen.down()
+def  tree(n):
+    if n >= 0:
+        if n <= 12:
+            pen.color(random.choice(["snow","lightcoral"]))  
+            pen.pensize(n/3)    
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)  
+        SB = random.randint(0,30)
+        SB1 = random.randint(1,15)
+        pen.forward(n)
+        pen.right(SB)
+        tree(n-SB1)
+        pen.left(SB*2)
+        tree(n-SB1)
+        pen.right(SB)
+        pen.up()
+        pen.backward(n)
+        pen.down() 
+    
+    
+tree(60)
+#画二叉树
+turtle.done()