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This article mainly introduces the relevant knowledge of "what are the four methods added to the list in python". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "what are the four methods added to the list in python" can help you solve the problem.

Add list 1) + add

2) append append

Only one element can be added to the list at a time, suitable for use in loops

3) extend stretching

You can add multiple elements to the list at a time

4) insert insertion

Both append and extend are added at the end, and insert can be inserted in the specified location.

The command functions service.insert (n _ journal'') to insert the contents of''into the nth and then service.insert (1 ~ th _ samba') inserts the samba after the first

Exercise:

Insert after the third one

After inserting into the second one

Insert two

The results show that firewalld is after samba. Because after the samba is inserted into the first, it becomes the second; at this point, the firewalld is inserted into the second, just after the samba.

Add an element at the specified location in the list

Python also provides the insert () method, which can insert an element at any specified location in the list. Its basic syntax is:

Source_list.insert (index,obj) in which

Source_list: for the list to be modified

Index: index the location to be inserted

Obj: the element to be inserted

Note: in Python, the position index of the start element of the list is 0. For example, to add the guest Hu qi after the Zhang san in the guests list, the corresponding statement is:

# create and initialize guests list guests= ['Zhang san','Li si','Wang wu','Zhao liu'] # add a guest guests.insert named Hu qi to the end of the guests list Zhang san (1) guests Hu qi' # output a new guests list print (guests)

The output is as follows:

['Zhang san','Hu qi','Li si','Wang wu','Zhao liu']

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