List of lists in Python

The sequence is the most basic data structure in Python. Each element in the sequence is assigned a number-its position, or index, the first index is 0, the second index is 1, and so on.

Python has 6 built-in types of sequences, but the most common are lists and tuples.

Sequences can be performed by operations including indexing, slicing, adding, multiplying, and checking members.

In addition, Python has built-in methods for determining the length of a sequence and determining the maximum and minimum elements.

A list is the most commonly used Python data type and can appear as a comma-separated value within a square bracket.

Data items for a list do not need to have the same type

Create a list by enclosing separate data items separated by commas in square brackets.

CRUD for---List

Python's total delete refrence are all using Del

---list script operators

The operands of the list to + and * are similar to strings. The + sign is used for the combined list, and the * number is used for repeating lists.

As shown below:

Python Expressions	Results	Description
Len ([1, 2, 3])	3	Length
[1, 2, 3] + [4, 5, 6]	[1, 2, 3, 4, 5, 6]	Combination
[' hi! '] * 4	[' hi! ', ' hi! ', ' hi! ', ' hi! ']	Repeat
3 in [1, 2, 3]	True	Whether the element exists in the list
For x in [1, 2, 3]: print x,	1 2 3	Iteration

---python list interception

The list of Python intercepts the type of string manipulation as follows:

=[' spam ',' spam ',' spam! ' ]

Operation:

Python Expressions	Results	Description
L[2]	' spam! '	Read the third element in the list
L[-2]	' Spam '	Reads the second-to-last element in a list
L[1:]	[' Spam ', ' spam! ']	To intercept a list starting with the second element

Python list Functions & methods

Python contains the following functions:

Serial Number	function
1	CMP (List1, List2) Compare two elements of a list
2	Len (list) Number of list elements
3	Max (list) Returns the maximum value of a list element
4	MIN (list) Returns the minimum value of a list element
5	List (seq) Convert a tuple to a list

Python contains the following methods:

Serial Number	Method
1	List.append (obj) Add a new object at the end of the list
2	List.count (obj) Count the number of occurrences of an element in a list
3	List.extend (seq) Append multiple values from another sequence at the end of the list (extend the original list with a new list)
4	List.index (obj) Find the index position of the first occurrence of a value from the list
5	List.insert (index, obj) Inserting an object into a list
6	List.pop (Obj=list[-1]) Removes an element from the list (the last element by default), and returns the value of the element
7	List.remove (obj) To remove the first occurrence of a value in a list
8	List.reverse () Reverse List of elements
9	List.sort ([func]) Sort the original list

List of lists in Python