Python：extend和append的用法

转于：https://www.cnblogs.com/subic/p/6553187.html

博主：subic

1）list.append(object) 向列表中添加一个对象object
2）list.extend(sequence) 把一个序列seq的内容添加到列表中

#使用append的时候，是将new_media看作一个对象，整体打包添加到music_media对象中

music_media = ['compact disc', '8-track tape', 'long playing record']
new_media = ['DVD Audio disc', 'Super Audio CD']
music_media.append(new_media)
print(music_media)
#输出：['compact disc', '8-track tape', 'long playing record', ['DVD Audio disc', 'Super Audio CD']]

#使用extend的时候，是将new_media看作一个序列，将这个序列和music_media序列合并，并放在其后面

music_media = ['compact disc', '8-track tape', 'long playing record']
new_media = ['DVD Audio disc', 'Super Audio CD']
music_media.extend(new_media)
print(music_media)
#输出：['compact disc', '8-track tape', 'long playing record', 'DVD Audio disc', 'Super Audio CD']