# append和extend区别
def append_extend():
    '''
    记住一点：append是追加，extend是对列表的扩展
    :return: 
    '''
    
    list1 = [1,2]
    list1.append([3,4])
    print list1    # [1, 2, [3, 4]]

    list1.extend([5,6])   # [1, 2, [3, 4], 5, 6]
    print list1

    list1.append('love')  # [1, 2, [3, 4], 5, 6, 'love']
    print list1

    list1.extend('python')   # [1, 2, [3, 4], 5, 6, 'love', 'p', 'y', 't', 'h', 'o', 'n']
    print list1