auto save

my_tree.py

+import turtle
+import random
+pen = turtle.Turtle()
+pen.color('sienna')
+pen.speed(1)
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+
+# 移动到起点
+pen.hideturtle()
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+
+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)
+        an = random.random()
+        pen.right(an*30)
+        le = 1.5*random.random()
+        tree(n - 10 * le)
+        pen.left(an*60)
+        tree(n - 10 * le)
+        pen.right(an*30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+tree(50)
+
+turtle.done()