save project

my_tree.py

+import turtle
+import random
+
+def tree(n):
+    if n >=0:
+        pen.pensize(n/10)
+        a=random.randint(0,30)
+        b=random.randint(1,15)
+        pen.forward(n)
+        pen.right(a)
+        tree(n-b)
+        pen.left(2*a)
+        tree(n-b)
+        pen.right(a)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+    if n<=12:
+        pen.pencolor('lightcoral') or pen.pencolor('snow')
+        pen.pensize(n)
+    else:
+        pen.pencolor('sienna')
+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(150)    # 后退
+pen.down()
+
+tree(60)
+pen.speed(10)
+turtle.done()