auto save

my_tree.py

-import turtle
+import turtle,random
 
 
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
@@ -12,4 +12,31 @@ pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
 
 
+def tree(n):
+    if n>=0:
+        if n<=12:
+            pen.pensize(n/3)
+            c=random.choice(["snow","lightcoral"])
+            pen.pencolor(c)
+        else:
+            pen.pensize(n//10)
+            pen.pencolor("sienna")
+
+        angle=random.randint(0,30)
+        length=random.randint(1,15)
+        #画树干部分
+        pen.forward(n)
+        #先画右边
+        pen.right(angle)
+        tree(n-length)
+        #画左边
+        pen.left(angle*2)
+        tree(n-length)
+        #后退
+        pen.right(angle)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+    
+tree(60)
 turtle.done()
 turtle.done()