save project

my_tree.py

@@ -12,26 +12,27 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 def tree(n):
-    if n>=50:
-        pen.pensize(n/10)
-        pen.forward(n)
-        a=random.randint(0,30)
-        b=random.randint(0,15)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
-        pen.up()
-        pen.backward(n)
-        pen.down()
-        if b<=12:
+    if n>=0:
+        if n<=12:
             c=random.randint(1,2)
             if c==1:
                 pen.color("snow")
             else:
                 pen.color("lightcoral")
-            pen.pensize(a*3)
-            
-tree(100)
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)
+        pen.forward(n)
+        a=random.random()
+        pen.right(30*a)
+        b=1.5*random.random()
+        tree(n-10*b)
+        pen.left(60*a)
+        tree(n-10*b)
+        pen.right(30*a)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(60)
 turtle.done()
\ No newline at end of file