save project

my_tree.py

+import turtle
+import random
+pen=turtle.Pen()
+pen.pendown()
+pen = turtle.Turtle()
+
+
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+pen.speed(0)
+
+# 移动到起点
+def tree(n):
+    if n>=0:
+        if n<=12:
+            color_list=['snow','lightcoral']
+            color=random.choice(color_list)
+            pen.pencolor(color)
+            pen.pensize(n/2) 
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+        pen.forward(n)
+        j=random.randint(0,20)
+        l=random.randint(1,15)
+        pen.right(j)
+        tree(n-l)
+        pen.left(2*j)
+        tree(n-l)
+        pen.right(j)
+        pen.penup()
+        pen.backward(n)
+        pen.down()     
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+tree(60)
+turtle.done()