save project

my_tree.py

+import turtle
+import random
+
+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()
+def tree (n):
+    if n >= 0:
+        d = int(random.randint(1,1000))
+        pen.pensize(n/10)
+        a = random.randint(0,30)
+        b = random.randint(1,15)
+        if n <=12:
+            if d <= 500:
+                pen.color('snow')
+            if d >500 :
+                pen.color('lightcoral') 
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+        pen.down()
+        pen.forward(n)
+        pen.right(a)
+        tree(n-b)
+        pen.left(2*a)
+        tree(n-b)
+        pen.right(a)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(60)
+turtle.done()
+
+
+
+