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diy.py

@@ -4,6 +4,5 @@ print(students)
 students.append("诺依")
 print(students)
 red=students[:3]
-blue=students[3:]
+blue=students[3 :]
 print(red) 
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-print(blue)
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im.py

+import turtle
+import random
+pen=turtle.Pen()
+def tree(n):
+    if n>=0:
+        if n <=12:
+            color_list =['snow','lightcoral'] 
+            color =random.choice(color_list)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+        angle=random.random() 
+        pen.forward(n)
+        pen.right(30*angle)
+        lenght=1.5*random.random()
+        tree(n-10*lenght) 
+        pen.left(60*angle)
+        tree(n-10*lenght)
+        pen.right(30*angle)
+        pen.up()    
+        pen.backward(n)
+        pen.down()
+w=turtle.Screen()
+w.bgcolor("wheat")
+pen.left(90)
+pen.up()
+pen.backward(150)
+pen.down()
+tree(60)
+turtle.done()
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