1. List insertion operation

1. Introduction to List#insert function

The Python list inserts elements by calling the List#insert function, which needs to pass in two parameters,

The first parameter is the subscript index;
The second parameter is the element to insert;

The function of this function is to insert a new element before the element specified by the subscript, and the element at the original subscript position is pushed to the back position;

List#insert function prototype:

    def insert(self, *args, **kwargs): # real signature unknown
        """ Insert object before index. 在索引之前插入对象。"""
        pass

2. Code example - list insert element

Code example:

"""
列表 List 常用操作 代码示例
"""

# 定义列表
names = ["Tom", "Jerry", "Jack"]

print(names)

# 插入数据
names.insert(1, "Trump")

print(names)

Results of the :

['Tom', 'Jerry', 'Jack']
['Tom', 'Trump', 'Jerry', 'Jack']

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2. List append element operation

1. Introduction to List#append function

The operation of adding elements to the list can be realized by calling the List#append function, and the added elements are directly placed at the end of the list;

An element can be appended;
It is also possible to append a list containing multiple elements, but the appended list is treated as one element;

List#append function prototype:

    def append(self, *args, **kwargs): # real signature unknown
        """ Append object to the end of the list.将对象追加到列表的末尾。 """
        pass

2. Code example - adding elements to the list