save project

my_tree.py

+import turtle
+import random
+def tree(n):
+    if n>=0:
+        pen.pensize(n/3)
+        pen.forward(n)
+        y=random.random()
+        pen.right(30*y)
+        j=1.5*random.random()
+        tree(n-10*j)
+        pen.left(60*y)
+        tree(n-10*j)
+        pen.right(30*y)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+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()
+#pen.forward(50)
+###pen.backward(50)
+
+#pen.right(60)
+#pen.forward(50)
+#pen.backward(50)
+#pen.left(30)
+#pen.backward(100)
+tree(60)
+turtle.done()
+
+