关于python:python列表中如何添加元素

Python增加元素有三种办法：append、extend、insert

append：向列表增加元素，增加到尾部

实例：

list=[“my”,”name”,”is”,”mark”,”age”,18]
print(“增加前：”,list)
list.append(“test”)
print(“增加后：”,list)
打印后果：

增加前： [‘my’, ‘name’, ‘is’, ‘mark’, ‘age’, 18]
增加后： [‘my’, ‘name’, ‘is’, ‘mark’, ‘age’, 18, ‘test’]

extend：将另外一个列表的元素逐个增加到指定列表中

实例：

list=[“my”,”name”,”is”,”mark”,”age”,18]
print(“extend前：”,list)
list2=[“A”,”B”]
list.extend(list2)
print(“extend后：”,list)
打印后果：

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

inset(index,objectA)：在指定地位index后面插入对象objectA

实例：

list=[“my”,”name”,”is”,”mark”,”age”,18]
print(“insert前：”,list)
list.insert(3,”test”)
print(“insert后：”,list)
打印后果：

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

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