save project

my_tree.py

+import turtle  
+from random import *      
+def tree(n):
+    if n>=0:
+        if n <=12:
+            color=['snow','lightcoral']
+            a=choice(color)
+            pen.color(a)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+
+            pen.pensize(n/10)
+        pen.forward(n)
+        angle= randint(0,30)
+        length=randint(1,15)
+        pen.right(angle)
+        tree(n-length)
+        pen.left(2*angle)
+        tree(n-length)
+        pen.right(angle)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+pen = turtle.Turtle()
+pen.color('sienna')
+pen.speed(90)
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+pen.left(90)
+tree(60)
+# 移动到起点
+# pen.left(90)
+# pen.up()
+# pen.backward(150)    # 后退
+# pen.down()
+# pen.forward(100)
+# pen.right(30)
+# pen.fd(50)
+# pen.up()
+# pen.fd(-50)
+# pen.left(60)
+# pen.down()
+# pen.fd(50)
+# pen.up()
+# pen.fd(-50)
+# pen.left(150)
+# pen.fd(100)
+turtle.done()