save project

my_tree.py

+import turtle
+
+pen = turtle.Turtle()
+pen.color('sienna')
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+def tree(n): # 画树枝
+    if n>=50:
+        pen.forward(n)
+        pen.right(30)
+        tree(n-10)
+        pen.left(60)
+        tree(n-10)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+
+pen.setheading(90)
+pen.up()
+pen.goto(0,-150)
+pen.down()
+pen.pensize(5)
+tree(100)
+
+turtle.done()
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+# 移动到起点
+# pen.left(90)
+# pen.up()
+# pen.backward(150)    # 后退
+# pen.down()
+# # 二叉树1
+# # pen.forward(100)
+# # pen.right(30)
+# # pen.forward(50)
+# # pen.backward(50)
+# # pen.left(60)
+# # pen.forward(50)
+# # 二叉树2
+# pen.forward(100)
+# # 右
+# pen.right(30)
+# pen.forward(50)
+# pen.up()
+# pen.backward(50)
+# pen.down()
+# #
+# pen.left(60)
+# pen.forward(50)
+# pen.up()
+# pen.backward(50)
+# pen.down()
+
+# pen.right(30)
+# pen.up()
+# pen.backward(100)