auto save

my_tree.py

+import turtle
+import random
+
+pen = turtle.Turtle()
+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(750)    # 后退
+pen.down()
+
+def tree(n):
+    if n >= 0:
+        color_list = ["snow","lightcoral"]
+        color = random.choice(color_list) 
+        pen.color(color)
+        pen.pensize(n/10)
+    else:
+        pen.color("sienna")
+        pen.pensize(n/10)
+    pen.forward(n)
+    angle = random.    
+        pen.forward(n)
+        pen.right(jiaodu)
+        tree(n-50)
+        pen.left(2*jiaodu)
+        tree(n-50)
+        pen.right(jiaodu)
+        pen.backward(n)
+        pen.down()
+
+tree(350)
+turtle.done()