save project

my_tree.py

 import turtle
-
+import random
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
-n=100
+n=250
 pen.lt(90)
 pen.up()
 pen.backward(n)    # 后退
@@ -13,16 +13,26 @@ pen.down()
 
 # 移动到起点
 def x(n):
-    if(n>=50):
+    if(n>=0):
+        if n<=12:
+            l=['snow','lightcoral']
+            c=random.choice(l)
+            pen.color(c)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+        a=random.randint(0,30)
+        b=random.randint(1,15)
         pen.fd(n)
-        pen.rt(30)
-        x(n-10)
-        pen.lt(60)
-        x(n-10)
-        pen.rt(30)
+        pen.rt(a)
+        x(n-b)
+        pen.lt(2*a)
+        x(n-b)
+        pen.rt(a)
         pen.up()
         pen.backward(n)    # 后退
         pen.down()
-x(100)
+x(80)
 
 turtle.done()