save project

my_tree.py

+import turtle
+from random import random
+from random import choice
+pen = turtle.Turtle()
+pen.color('sienna')
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+pen.speed(0)
+pen.pensize(1)
+def draw(n):
+    if n>=0:
+        if n<=12:
+            color_list=["snow","lightcoral"]
+            color=choice(color_list)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)
+        angle=random()
+        length=1.5*random()
+        pen.fd(n)
+        pen.right(30*angle)
+        draw(n-10*length)
+        pen.left(angle*60)
+        draw(n-10*length)
+        pen.right(30*angle)
+        pen.up()
+        pen.backward(n)    # 后退
+        pen.down()
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+draw(50)
+turtle.done()
\ No newline at end of file