save project

my_tree.py

 import turtle
+import random
 
+def tree(n):
+    
+    
+    if n >= 0:
+        pen.pensize(n/10)
+        angle = random.randint(0,30)
+        length = random.randint(1,15)
+        if n-length <= 12:
+            pen.color("snow" or "lightcoral")
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)
+        pen.forward(n)
+        pen.right(angle)
+        pen.down()
+        tree(n-length)
+        pen.up()
+        pen.left(2*angle)
+        pen.down()
+        tree(n-length)
+        pen.up()
+        pen.right(angle)
+        pen.backward(n)
 pen = turtle.Turtle()
+pen.speed(0)
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
@@ -11,18 +37,19 @@ pen.left(90)
 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.right(30)
-pen.backward(100)
+# 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.right(30)
+# pen.backward(100)
+tree(60)