bicycles = ['trek', 'cannondale', 'redline', 'specialized']

 print(bicycles)

 bicycles.append("honda") #在列表尾追加一个新元素

 print(bicycles)

 bicycles.insert(0,"piaggio") #在列表索引处添加一个新元素

 print(bicycles)

 运行结果应该如下：

     ['trek', 'cannondale', 'redline', 'specialized']

     ['trek', 'cannondale', 'redline', 'specialized','honda']

     ['piaggio','trek', 'cannondale', 'redline', 'specialized','honda']