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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David Cao
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