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
+pen.speed(10)
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+def tree(n):
+    if n>=0:
+        if n<=12:
+            a=['snow','lightcoral']
+            b = random.choice(a)
+            pen.color(b)
+            pen.pensize(n / 3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n / 10)
+        pen_1=random.randint(0,30)
+        pen_2=random.randint(0,15)
+        pen.forward(n)
+        pen.right(pen_1)
+        tree(n-pen_2)
+        pen.left(2*pen_1)
+        tree(n-pen_2)
+        pen.right(pen_1)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(60)
+turtle.done()