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')      # 小麦
+pen.pensize(5)
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 前进4
+pen.down()
+   
+
+def tree(n):
+    if n >=10:
+        if n <=12:
+            pen.pensize(n/5)
+            pen.color(random.choice(['snow','lightcoral']))
+        else:
+            pen.pensize(n/10)
+            pen.color('sienna')
+        angle=random.randint(1,30)
+        length=random.randint(1,15)
+        pen.forward(n)
+        pen.right(angle)
+        tree(n-length)
+        pen.left(angle*2)
+        tree(n-length)
+        pen.right(angle)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(50)
+turtle.done()