save project

my_tree.py

 import turtle
 import turtle
-
+import random
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
 # 画布大小
 # 画布大小
@@ -11,11 +11,35 @@ pen.left(90)
 pen.up()
 pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
-pen.down
-pen.forward(200)
-pen.right(30)
-pen.forward(100)
-pen.forward(-100)
-pen.left(60)
-pen.forward(100)
+
+# pen.forward(200)
+# pen.right(30)
+# pen.forward(100)
+# pen.forward(-100)
+# pen.left(60)
+# pen.forward(100)
+def tree(n):
+    if n>0:
+        angle=random.randint(10,30)
+        rnm=random.randint(3,15)
+        if n<=12:
+            a=random.choice(["snow",'pink','lightcoral'])
+            print(a)
+            pen.color(a)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+
+        pen.forward(n)
+        pen.right(angle)
+        tree(n-rnm)
+        pen.left(2*angle)
+        tree(n-rnm)
+        pen.left(-angle)
+        pen.up()
+        pen.forward(-n)
+        pen.down()
+        
+tree(50)
 turtle.done()
 turtle.done()
\ No newline at end of file