python 数据类型---列表使用 之二 （增删改查）

Posted 2020-08-21

列表的操作

1.列表的修改

>>> name
[‘Frank‘, ‘Lee‘, 2, [‘Andy‘, ‘Troy‘]]
>>> name[0] = "Frank Bian"
>>> name
[‘Frank Bian‘, ‘Lee‘, 2, [‘Andy‘, ‘Troy‘]]

2.列表的插入

>>> name
[‘Frank Bian‘, ‘Lee‘, 2, [‘Andy‘, ‘Troy‘]]
>>> name.insert(1,"Marlon")  #插入到位置就是其下标的值
>>> name
[‘Frank Bian‘, ‘Marlon‘, ‘Lee‘, 2, [‘Andy‘, ‘Troy‘]]

3 列表的追加（append object to end）

>>> name
[‘Frank Bian‘, ‘Marlon‘, ‘Lee‘, 2, [‘Andy‘, ‘Troy‘]]
>>> help(name.append)

>>> help(name.append)

>>> name.append(‘Duff‘)
>>> name
[‘Frank Bian‘, ‘Marlon‘, ‘Lee‘, 2, [‘Andy‘, ‘Troy‘], ‘Duff‘]

4 列表元素删除（L.remove(value) -> None -- remove first occurrence of value.
    Raises ValueError if the value is not present.）

>>> name.append(‘Duff‘)
>>> name
[‘Frank Bian‘, ‘Marlon‘, ‘Lee‘, 2, [‘Andy‘, ‘Troy‘], ‘Duff‘, ‘Duff‘]
>>> name.remove(‘Duff‘)
>>> name
[‘Frank Bian‘, ‘Marlon‘, ‘Lee‘, 2, [‘Andy‘, ‘Troy‘], ‘Duff‘]