save project

my_tree.py

+import turtle
+import random
+
+def tree(n):
+    if n >= 0:
+        pen.pensize(n/10)
+        pen.forward(n)
+        a=random.randint(0,30)
+        e=random.randint(1,15)
+        pen.right(a)
+        tree(n-e)
+        pen.left(2*a)
+        tree(n-e)
+        pen.right(a)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+pen = turtle.Turtle()
+pen.speed(0)
+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.down()
+# pen.forward(100)
+# pen.right(30)
+# pen.forward(50)
+# pen.right(180)
+# pen.backward(-50)
+# pen.left(60)
+# pen.forward(-50)
+# pen.up()
+# pen.forward(50)
+turtle.done()