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python中insert()函数的用法_Python list insert()用法及代码示例

发布时间:2025/5/22 python 57 豆豆
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insert()是Python中的内置函数,可将给定元素插入列表中的给定索引。

用法:

list_name.insert(index, element)

参数:

index - the index at which the element has to be inserted.

element - the element to be inserted in the list.

返回值:

This method does not return any value but

it inserts the given element at the given index.

错误:

If anything other then a list is used with

insert(), then it returns an AttributeError.

注意:如果给定索引> = length(list),则它将插入列表的末尾。

代码1:

# Python3 program for use

# of insert() method

list1 = [ 1, 2, 3, 4, 5, 6, 7 ]

# insert 10 at 4th index

list1.insert(4, 10)

print(list1)

list2 = ['a', 'b', 'c', 'd', 'e']

# insert z at the front of the list

list2.insert(0, 'z')

print(list2)

输出:

[1, 2, 3, 4, 10, 5, 6, 7]

['z', 'a', 'b', 'c', 'd', 'e']

代码2:

# Python3 program for error

# of insert() method

# attribute error

string = "1234567"

string.insert(10, 1)

print(string)

输出:

Traceback (most recent call last):

File "/home/2fe54bd8723cd0ae89a17325da8b2eb5.py", line 7, in

string.insert(10, 1)

AttributeError:'str' object has no attribute 'insert'

实际应用:

在任何元素之前的列表中插入:

代码3:

# Python3 program for Insertion in a list

# before any element using insert() method

list1 = [ 1, 2, 3, 4, 5, 6 ]

# Element to be inserted

element = 13

# Element to be inserted before 3

beforeElement = 3

# Find index

index = list1.index(beforeElement)

# Insert element at beforeElement

list1.insert(index, element)

print(list1)

输出:

[1, 2, 13, 3, 4, 5, 6]

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