L 24: LISTS IN PYTHON | LIST OPERATIONS IN PYTHON | PYTHON TUTORIALS FOR BEGINNERS смотреть онлайн

Python lists are one of the most versatile data types that allow us to work with multiple elements at once.
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Create Python Lists:
In Python, a list is created by placing elements inside square brackets [], separated by commas.
A list can have any number of items and they may be of different types (integer, float, string, etc.).
A list can also have another list as an item. This is called a nested list.

Access List Elements:
There are various ways in which we can access the elements of a list.
List Index: We can use the index operator [] to access an item in a list. In Python, indices start at 0. So, a list having 5 elements will have an index from 0 to 4.
Trying to access indexes other than these will raise an IndexError. The index must be an integer. We can't use float or other types, this will result in TypeError.
Nested lists are accessed using nested indexing.
Negative indexing: Python allows negative indexing for its sequences. The index of -1 refers to the last item, -2 to the second last item and so on.

List Slicing in Python: We can access a range of items in a list by using the slicing operator :.

Add/Change List Elements: Lists are mutable, meaning their elements can be changed unlike string or tuple. We can use the assignment operator = to change an item or a range of items.

Delete List Elements: We can delete one or more items from a list using the Python del statement. It can even delete the list entirely.
We can use remove() to remove the given item or pop() to remove an item at the given index.
The pop() method removes and returns the last item if the index is not provided. This helps us implement lists as stacks (first in, last out data structure).
And, if we have to empty the whole list, we can use the clear() method.

Python List Methods
Python has many useful list methods that makes it really easy to work with lists. Here are some of the commonly used list methods.
append(): adds an element to the end of the list
extend(): adds all elements of a list to another list
insert(): inserts an item at the defined index
remove(): removes an item from the list
pop(): returns and removes an element at the given index
clear(): removes all items from the list
index(): returns the index of the first matched item
count(): returns the count of the number of items passed as an argument
sort(): sort items in a list in ascending order
reverse(): reverse the order of items in the list
copy() : returns a shallow copy of the list
00:00 - Introduction
01:32 - What is a List
05:16 - Finding length of a list
06:27 -Adding elements in a list
10:45 -Removing elements in a list
14:01 - Concatenation of two lists
16:27 -Slicing 16:27
19:17 - Displaying elements in the list
21:15 - Implementation using Jupyter Notebook
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