save project

my_tree.py

 import turtle
+import random
 
 pen = turtle.Turtle()
+pen.speed(700)
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
@@ -12,21 +14,27 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
-pen.forward(100)
-
-pen.right(30)
-pen.forward(50)
-pen.up()
-pen.backward(50)
-pen.down()
-
-pen.left(60)
-pen.forward(50)
-pen.up()
-pen.backward(50)
-pen.down()
-
-pen.up()
-pen.backward(100)
+def tree(n):
+    if n>=0:
+        if n<=12:
+            c = ["snow","lightcoral"]
+            o = random.choice(c)
+            pen.pencolor(o)
+            pen.pensize(n/3)
+        else:
+            pen.pencolor("sienna")
+            pen.pensize(n/10)
+        pen.forward(n)
+        a = random.randint(0,30)
+        l = random.randint(1,15)
+        pen.right(a)
+        tree(n-l)
+        pen.left(2*a)
+        tree(n-l)
+        pen.right(a)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(70)
 
 turtle.done()
\ No newline at end of file