save project

my_tree.py

+import turtle
+import random
+pen = turtle.Turtle()
+pen.shape("turtle")
+pen.color('sienna')
+pen.pensize(3)
+pen.speed(0)
+# 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:
+        if n <=8:
+            color = ['snow','lightcoral']
+            a = random.choice(color)
+            pen.color(a)
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/8)
+        pen.pensize(n/10)
+        pen.forward(n)
+        angel = random.randint(1,30)
+        lenth = random.randint(1,12)
+        pen.left(angel)
+        tree(n-lenth)
+        pen.right(2*angel)
+        tree(n-lenth)
+        pen.left(angel)
+        pen.backward(n)
+        pen.down()
+        
+        pen.hideturtle()
+
+
+tree(60)
+turtle.done()