save project

my_tree.py

-import turtle
+import turtle,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.backward(150)
 pen.down()
+pen.speed(0)
+
+# 移动到起点
+def tree(n):
+    if n>=0:
+        
+        if n<=12:
+            pen.pensize(n/3)
+            c=random.choice(["snow","lightcoral"])
+            pen.pencolor(c)
+        else:
+            pen.pensize(n//10)
+            pen.pencolor("sienna")
+
+        angle = random.randint(0,30)
+        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()
+
 
-turtle.done()
+tree(60)
+turtle.done()
\ No newline at end of file