Update 4-10.py

修改了第二行，返回中间三个元素应该是3:6或2:5

Author: alberthao

chapter04/4-10.py

@@ -1,5 +1,5 @@
 msg1 = ['The','first','three','items','in','the','list','are:']
 print(msg1)
 print(msg1[0:3])
-print(msg1[2:6])
-print(msg1[-3:])
+print(msg1[3:6])
+print(msg1[-3:])