save project

my_tree.py

 import turtle
 import turtle
+import random
 def tree(n):
 def tree(n):
-    if n>=50:
-    pen.forward(n)
-    pen.right(30)
-    tree(n-50)
-    pen.left(60)
-    tree(n-50)
-    pen.right(30)
-    pen.up()
-    pen.backward(n)
-    pen.down()
+    if n>=0:
+        if n <=12:
+            color_list=['snow','lightcoral']
+            color=random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)
+
+    
+        pen.forward(n)
+        angle=random.random()
+        pen.right(30*angle)
+        length=1.5*random.random()
+        tree(n-10*length)
+        pen.left(60*angle)
+        tree(n-10*length)
+        pen.right(30*angle)
+        pen.up()
+        pen.backward(n)
+        pen.down()
 # 画布大小
 # 画布大小
 w = turtle.Screen()
 w = turtle.Screen()
-w.bgcolor('wheat')      # wheat小麦
-
+w.bgcolor('wheat')      
 
 
+tree(60)
 # 移动到起点
 # 移动到起点
-pen.left(90)
-pen.up()
-pen.backward(150)    # 后退
-pen.down()
-tree(100)
+
 turtle.done()
 turtle.done()
\ No newline at end of file