Python 列表如何添加元素

Posted 2022-02-14 CaoDavidgogo

Python添加元素有三种方法：append、extend、insert

append：向列表添加元素，添加到尾部

实例：

list=["my","name","is","mark","age",18]
print("添加前：",list)
list.append("test")
print("添加后：",list)
打印结果：

添加前： [my, name, is, mark, age, 18]
添加后： [my, name, is, mark, age, 18, test]

extend：将另外一个列表的元素逐一添加到指定列表中

实例：

list=["my","name","is","mark","age",18]
print("extend前：",list)
list2=["A","B"]
list.extend(list2)
print("extend后：",list)
打印结果：

extend前： [my, name, is, mark, age, 18]
extend后： [my, name, is, mark, age, 18, A, B]

inset(index,objectA)：在指定位置index前面插入对象objectA

实例：

list=["my","name","is","mark","age",18]
print("insert前：",list)
list.insert(3,"test")
print("insert后：",list)
打印结果：

insert前： [my, name, is, mark, age, 18]
insert后： [my, name, is, test, mark, age, 18]

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