Python Lists | Lists in Python examples | Indexing | Nested Lists | Mutable | Negative index | CBSE
In this Python tutorial, we will learn: Lists in Python: An Introduction, empty list, Indexing, Negative index, Indexing Error, Type error, Lists are mutable, and Nested Lists with examples.
What is a list in Python?
A list is a value that contains multiple values in an ordered sequence.
How to create a list in Python?
A list begins with an opening square bracket and ends with a closing square bracket, [].
[‘cat’, ‘dog’, ‘horse’, ‘cow’] is an example of a list value.
Values inside the list are also called items or elements.
In a list, items are separated with commas.
What is an Indexing in list in Python?
Each item in the list can be individually accessed using its index.
An index is an integer.
An index of a list starts from 0. The first item in the list is at index 0, the second item is at index 1, the third item is at index 2, and so on.
How to access individual items in a list in Python?
We can access an item in the list by specifying its index within square brackets.
a=['cat', 'dog', 'horse','cow’]
print(a[0])
Output:
cat
What is negative index in Python?
We can also use negative integers for the index.
The integer value -1 refers to the last index in a list, the value -2 refers to the second-to-last index in a list, and so on.
What is Indexing error in Python?
Python will return an IndexError error message if you use an index that exceeds the index value in your list.
What is type error in indexing in Python?
TypeError error:
Indexes can be only integer values; floats data types will cause a TypeError error.
What is mutable in Python?
Lists are mutable. That means that the value of an item in a list can be modified with an assignment statement.
What is nested lists in Python?
Lists can also contain other list values, known as multi-dimensional lists or nested lists.
The values in these lists of lists can be accessed using multiple indexes.
Example: a[0][0]
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Python Lists | Lists in Python with examples |Indexing | Nested Lists | Mutable | Negative index | CBSE | Indexing Error
