insert()是Python中的內置函數，可將給定元素插入列表中的給定索引。

用法:

list_name.insert(index, element)

參數：

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.

錯誤：

If anything other then a list is used with

insert(), then it returns an AttributeError.

注意：如果給定索引> = length(list)，則它將插入列表的末尾。

代碼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)

輸出：

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

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

代碼2：

# Python3 program for error

# of insert() method

# attribute error

string = "1234567"

string.insert(10, 1)

print(string)

輸出：

Traceback (most recent call last):

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

string.insert(10, 1)

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

實際應用：

在任何元素之前的列表中插入：

代碼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)

輸出：

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

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