save project

my_tree.py

+import random 
+import turtle
+def tree(n):
+    if n>=0:
+        if n < 12:
+            color_list = ['snow','lightcoral']
+            color = random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/20)
+        
+        pen.fd(n)
+        angle = random.random()
+        pen.rt(30*angle)
+        length = 1.5*random.random()
+        tree(n-10*length)
+        pen.lt(60*angle)
+        tree(n-10*length)
+        pen.pu()
+        pen.rt(30*angle)
+        pen.bk(n)
+        pen.down()
+
+
+
+
+
+pen = turtle.Pen()
+pen.speed(0)
+## 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+
+pen.pd()
+ #移动到起点
+pen.left(90)
+pen.up()
+pen.backward(250)    # 后退
+pen.down()
+
+
+
+
+
+
+
+tree(75)
+turtle.done()
+#pen.fd(100)
+#pen.rt(30)
+#pen.fd(50)
+#pen.pu()
+#pen.bk(50)
+#pen.lt(60)
+#pen.pd()
+#pen.fd(50)
+#pen.pu()
+#pen.bk(50)
+#pen.rt(30)
+#pen.bk(100)
+#pen.hideturtle()
+