save project

my_tree.py

 import turtle
 import random
-color=["lightcoral","white"]
+d=["snow","lightcoral"]
 def tree(n):
-    if n>=50:
+    if n>=0:
         pen.pensize(n/10)
         pen.forward(n)
-        a=random.randint(0,30)
+        c=random.choice(d)
+        s=random.randint(0,30)
         l=random.randint(1,15)
-        pen.right(a)
+        pen.right(s)
         tree(n-l)
-        pen.left(2*a)
+        pen.left(2*s)
         tree(n-l)
-        pen.right(a)
+        pen.right(s)
         pen.up()
         pen.backward(n)    # 后退
         pen.down()
-        if l<=12:
+        if s<=12:
             pen.color(c)
-            pen.pensize(l/10)
+            pen.pensize(s/3)
         else:
-            pen.color('sienna')
-            pen.pensize(l/30)
-
+            pen.color("sienna")
+            pen.pensize(s/10)
 pen = turtle.Turtle()
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
-
+pen.color("sienna")
 # 移动到起点
 pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
-tree(90)
+tree(60)
 turtle.done()