python中向列表中添加元素

python中向列表中添加元素

append、追加一个元素

extend、扩展多个元素

insert、插入一个元素。

1、append

>>> test1 = ["aaa","bbb","ccc"]
>>> test1
['aaa', 'bbb', 'ccc']
>>> test1.append("ddd")
>>> test1
['aaa', 'bbb', 'ccc', 'ddd']

2、extend

>>> test1
['aaa', 'bbb', 'ccc', 'ddd']
>>> test1.extend(["eee","fff"])
>>> test1
['aaa', 'bbb', 'ccc', 'ddd', 'eee', 'fff']

3、insert

>>> test1
['aaa', 'bbb', 'ccc', 'ddd', 'eee', 'fff']
>>> test1.insert(1,1000)
>>> test1
['aaa', 1000, 'bbb', 'ccc', 'ddd', 'eee', 'fff']

末尾插入

>>> test1
['aaa', 1000, 'bbb', 'ccc', 'ddd', 'eee', 'fff']
>>> test1.insert(len(test1),2000)
>>> test1
['aaa', 1000, 'bbb', 'ccc', 'ddd', 'eee', 'fff', 2000]